Movement Type Account Assignment and Account Modifier usage

Dear All.

Scenario:

We have a requirement for some of our sales transactions to post to an expense account at PGI in the delivery rather than the COGS account.

So we're investigating assigning another movement type (copy 601) to the schedule line category used for these sales transactions.

Prior to doing this though, I wanted to see if it's possible to still use the 601 movement type and use an Account Modifier (or other function) to point these sales to the different offsetting GL account?

I see how to assign the account modifier's to the movement type, but I'm not seeing how this relates to the transaction and how the system will pick up one account modifier vs another when the movement is posted?

When I check the material document and accounting document generated from the delivery PGI, I see the movement type, accounts posted to and various other data, but no account modifier.

Q:

Is it possible to have one movement type post to different offsetting accounts for this type of scenario?

Also, how does the account modifier tie in to the transaction?

Many Thanks.