FET form used for purchasing a second condo unit

Hello,

2 cases:

1) a couple years ago transferred money (6m) to Thailand to buy a condo unit and got a FET form for the full amount transferred in (6m). Used the FET form to purchase a unit with sell price of 4m at the Land Office.

Can I somehow now do anything to use the leftover money of the initial transfer (2m) to buy another condo unit? so for example getting a new FET form or somehow using the old one, etc

2) a couple years ago transferred money (6m) to Thailand to buy a condo unit and got a FET form for the amount of the sell price (4m). Used the FET form to purchase a unit with sell price of 4m at the Land Office.

Can I somehow now do anything to use the leftover money of the initial transfer (2m) to buy another condo unit? so for example getting a new FET form, etc

Thanks a lot!