You're asking how to copy data from the linked table to the local table? You run an append query. If the sql data is volatile, you'd need to run an update query, which I would do first, then append. To update, you'd put the sql table and field names as the values to update to in the query design grid and join on the PK fields. To append, I find it easier to construct the sql statement and execute in code to avoid the Access prompt and error messages about not being able to append all records when unique indexes are involved. It's one of the rare times I turn off warnings and just execute the sql (error handling routine to ensure they're turned back on is a must IMO). Existing records are not duplicated and no warnings and no need for complicated joins or nested/sub queries to avoid existing records.
The more we hear silence, the more we begin to think about our value in this universe.
Paraphrase of Professor Brian Cox.