What is the best way to add items to a list in bulk?

I have a table dimensioned by Position and Version. Our users would like the ability to add 100+ positions at a time, but the Bulk Add to List functionality only seems to be available in the actual List itself, and cannot be enabled for a table of metrics dimensioned by Position and Version.

The Position list needs to have auto-generated Unique IDs too, which prevents us from allowing users to upload a csv to create new positions.

Does anyone have any suggested workarounds for this? Thanks in advance!