However, I think that your question specifically is that you want to put sample data into a solution. Here is how I would approach that from a developer's perspective:
1. Identify where you want the data to be populated. Note the menu path to get to that screen. 2. Open the solution in the SDK. Go to the UiMetaModel. This is found at: Package Explorer -> expand module name -> double click on Module Process Template.mpt -> select the UiMetaModel tab 3. Identify the view/report/user defined page which matches the menu path. 4. Go to the view/report/user defined page and identify which data model is used to populate it. 5. Load your data into the data model.
Optionally, instead of steps 1-3 you may be able to use the web browser's developer console to identify which view/report/user defined page you are looking at.