> For the complete documentation index, see [llms.txt](https://docs.open-systems-pharmacology.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.open-systems-pharmacology.org/v13/working-with-pk-sim/pk-sim-documentation/importing-exporting-project-data-models.md).
# Importing and Exporting Project Data and Models
## Importing Observed data
The Open Systems Pharmacology Suite offers a convenient handling of experimental time-values data. The process of loading of observed data from file formats like MS Excel, CSV, or NONMEM, is described in [Shared Tools - Import and edit of Observed Data](/v13/shared-tools-and-example-workflows/import-edit-observed-data.md).
## Importing Individual and Population Simulation
The **Import** function of individual and population simulations allows you to use simulations that have been modified outside of PK-Sim® - most likely using MoBi® - in the PK-Sim® environment. This has several advantages:
* Simulations are handled in the well-known PK-Sim® environment.
* Performing population simulations with models extended in MoBi.
* Performing PK parameter analyses with models extended in MoBi.
#### Loading an individual simulation
A simulation previously exported as a \*.pkml file from PK-Sim® or MoBi® can be imported into the current project. To import an individual simulation:
* Click on the **Import/Export** tab then click on the **Individual Simulation** icon 
and select the \*.pkml file to be imported. The simulation will be imported into the project and will be available from the Simulation Explorer.
* Imported simulations can be run and analysed as any standard PK-Sim® simulation. However, the structure of the simulation cannot be altered. That means that it is not possible to swap parts of the simulation using the building block concept described in [Modules, Philosophy, and Building Blocks](/v13/open-systems-pharmacology-suite/modules-philsophy-building-blocks.md).
* If an imported simulation contains parameters that are unknown in PK-Sim®, they can be found in the simulation parameter tree under the node MoBi®.
#### Loading a population simulation
Similarly to individual simulations, a simulation previously exported as a \*.pkml file from PK-Sim® or MoBi® can be imported into the current project as a population simulation. As the \*.pkml exports only contain individual simulation and no information about the population, population information must be either a) loaded from a \*.CSV file (e.g., previously exported from PK-Sim or created in R), or a Population Building Block must be created and assigned to the simulation. To import a population simulation:
* Click on the **Import/Export** tab, then click on the **Population Simulation** icon 
. In the **Simulation** section of the "Import Population Simulation" dialog, select the \*.pkml file to be imported.
* In the **Population** 
section, the population needs to be specified. There are **three** different ways of defining the aforementioned population:
1. Use a population that is defined as building block in your current project. Available populations are itemized in the drop down menu of the **Population** field. In addition, you can define a new population by clicking on the **Add** button or load a population from a template by clicking on the **Load from template** 
button.
2. Load a population from a .CSV file. This is a file that was previously generated from a population and saved in CSV format.
* Use this option if you want to manually modify the default distribution generated by PK-Sim® for a given parameter or if you wish to vary parameters that were created in MoBi® and that PK-Sim® is not aware of. The file is selected by specifying the population file path.
3. Allocate the number of individuals. This is typically used when importing a simulation that was entirely created in MoBi® and is not based on a PK-Sim® model. In that case, all distributed parameters defined in the simulation will be randomly varied according to their distribution. Also all parameters marked with the flag “Can be varied in a population” in MoBi® can be varied manually after importing in the **User Defined Variability** tab of PK-Sim®.
## Export To Excel®
You can export the simulation results (time-values profiles within all included organs and compartments) to MS-Excel®.
* Right mouse click on the simulation name within the **Simulations Explorer** and select **Export results to Excel**
A window opens where you can enter the Excel® file name and the file type (\*.xls or \*.xlsx). Then Excel® is automatically started showing the exported data.
## Export To CSV
You can export the simulation results (time-values profiles within all included organs and compartments) to a text file in CSV format. The procedure is identical to the export to Excel®.
## Send To MoBi®
You can export a PK-Sim® simulation to MoBi® by one of the following steps:
* Right mouse click on the simulation name within the **Simulations Explorer** and select **Export To MoBi...** 
The program MoBi® will open with the exported simulation. You can then save the exported simulation within MoBi® in MoBi® format (\*.mbp3 file).
## Export to \*.pkml file for MoBi®
The **Shared Modeling File (\*.pkml)** can be used to transfer a PK-Sim® simulation into a MoBi® project. To export a PK-Sim® simulation to a \*.pkml file:
* Right mouse click on the simulation name in the **Simulations Explorer** 
.
and select **Save Simulation to MoBi pkml format ...**
A window opens where you can choose the directory and enter the \*.pkml file name. The file is saved an can be subsequently opened from MoBi®.
{% hint style="info" %}
The "Send to MoBi®" function described above is identical to exporting a simulation to a \*.pkml file and then opening this file from MoBi®.
{% endhint %}
## Exporting Simulation Structures To File
You can export a PK-Sim® simulation to a text file that contains all model and simulation details: model structure, rate equations and parameter values. You can export the simulation by:
* Right mouse clicking on the simulation name within the **Simulations Explorer** and selecting **Export Simulation Structure To File...**
A window opens where you can choose the directory and enter the file name. The file is saved and can be opened with a suitable text editor.
## Exporting the Project History To File
To export the project history that contains any user action to an Excel® file:
* Click on the **Export History** icon 
in the **Export Project** group of the **Import/Export** tab.
A window opens where you can choose the directory and enter the Excel file name.
## Exporting Population data
To export the physiological parameters which are varied within a population to a table (\*.csv format):
* Right mouse click on the population name within the **Building Blocks Explorer** and select **Export To CSV...**
* If you have created a population simulation, you can also export the population data by right mouse click on the simulation name within the **Simulations Explorer** and select **Export To CSV...**.
## Exporting Project to Snapshot / Loading Project from Snapshot
Projects, and single building blocks, can be exported to and recreated from snapshots in [JSON format](https://en.wikipedia.org/wiki/JSON). S. [Snapshots](/v13/working-with-pk-sim/pk-sim-documentation/pk-sim-snapshots.md) for details.