Sounds easy. I would clarify, and if you still have problem, please describe at which step.
1. all the fields Except linked field
2. Find all the records, linked to initial (which is trigger). 'Where {Link field} _has any of_ [Airtable record ID ]" (Dynamic from step 1)
3.Use list for repeating group, Create record in Tab2, choose each editable field, use value from 'Current item', the last is Linked field, insert Dynamic - choose step 2 (Create record in Table1) - Record ID