multiple attachment in Planning capex application

Hello experts,

I apologize in advance to be vague.

We are currently on 11.1.2.1 version.

I would like to know what would be the best way to manage the documentations related to different projects in capital budget/expense type planning applications.

In our case the location manager fax a signed request document to the corporate approval manager, the requests come in image format. 

Say for example a particular project "A"  have multiple spending requests throughout the year.  It’s a million dollar project and maybe the first request is $250k/ gets approved and then second request is $250k/ gets approved and final request is $500k/ gets approved.