What if we receive all assets (PC's) for example but not pay all the invoice for supplier (CIP)?

Summary:

-The assets for example is about 500 PC,

-The supplier supply all units to our location but the total due amount of invoices are not paid once(two payments), so when transfer the first invoice from payable to assets module, the business user add this invoice to asset(via add to asset button) then split it into 500 asset(the same of # units) so the system give each asset (each PC) the same cost(which is not true since the total payments are not done yet).

when the second payment is reached the due date and transferred to assets module, the user can't split again to the same all created assets in case to update the each cost for each PC, so if the user added the invoice to one asset the transfer the cost to already split assets which needs a lot of time