Use Single footprint for both sections.

Hello there,

Thanks for reaching out! To begin with, you need to follow this guide first on how to import the symbol that has a multi-section:

https://support.snapeda.com/en/articles/3045643-how-to-import-multi-section-symbols-in-altium

Once done, please check the following:

1. Open the Schematic Library where you've imported the multi-symbol component.
2. Select the Multi-Symbol Component from the components list.
3. Go to the Properties Panel on the right side.
4. Click on "Add Footprint" to add a footprint.
5. Search and Select the Footprint you want to use. If it's not in the current library, you might need to link or import the correct PCB Library.
6. Assign this Footprint. This single footprint will be assigned to all the sections/parts of your multi-symbol component.
7. Save the Schematic Library.

If you need more assistance, please let us know!

Kind regards,
Ron