quantity variance in repetitive manufacturing

Is it possible to track material quantity variance in repetitive manufacturing?

when i backflush the material consumption is recorded as per BOM, can i seperate goods issue, confirmations in backflushing or not.

As i see in backflushing i can seperately post components consumption, activities confirmation and assembly confirmation does system suggest the quantities as per routing and bom which are editable i.e. can i post actual consumption or not?