How to setup AP Input tax code R12 without defaulting to any AP invoice calculation?

Hi,

My user is requesting to setup the AP input tax code and let them enter the tax code themselves at the AP invoice level. They don't want the system defaulting any tax code and autocalculate the tax line for them.

I understand how to setup tax rule to default and autocalculate the tax based on the tax rule. But I don't know what should be done for not defaulting the tax code to the AP invoice.

If I don't enable the tax event for payables invoice in the tax rule, can the tax code setup for input tax be used in AP invoice when I enter the AP invoice?