1. Open the Tree Counter tab. Tree counter allows you to create hierarchical values in selected columns by combining Root name (1) with an automatically increasing value of the Counter. Enter the counter’s initial value in the Counter format field (2). You can also insert a Delimiter (3) between the counter value and the Root name. After you have created new file names, click "Apply". New file names will be displayed in the New File Name column.

2. Now you can copy new file names to the Part Number field. Right click on New File Name column, and select "Copy values to" -> "Part Number".

3. Click on the report generation button.                

4. Make sure that there are no text messages highlighted in red in the Report window. If you find such messages, click on them and all problematic components will be highlighted in the model three. If no messages highlighted in red appear in the Report window, click "Execute copy".

5. Click "Open copy in Inventor".

6. Now you can modify the new assembly without changing its original file.