I don't think you can transfer iTunes purchases like that.
I somewhat suspect that your best option might actually be to sign into his iTunes account on the new MacBook first, that ought to associate the pre-installed software with his account.
Then you can sign out, sign back in as you and because you already have the apps on your account, they'll continue to be updated fine. Probably. Never tried it, but it seems like it ought to work![]()
Tx for the info. Will try tomorrow.