Xcart Pro Customization

Avg Bid (USD)
Project Budget (USD)
$30 - $250

Project Description:
I run X-Cart Pro 4.5.2 and in the original Version
I can set up only a general provider Provision for all Providers in this installation in /admin/configuration.php

What I need is a solution to set up the Provision on a individual Basis, maybe in the provider Profile, access only from shop admin.
for example:
Provider A: Provision 70%
Provider B: Provision 68%
Provider C: Provision 35%

I need to be able to change this settings for future sales:

Provider Provision is set to 35% and from April 01 he get an upgrade on 50%
until march 31 the provision must stay on 35%,
for all orders from April 01 the Provision must change to 50%
The same must work when I do a downgrade 50% ----> 35%

Can you do it ,
and how long will it last?

Skills required:
eCommerce, MySQL, PHP, Software Architecture
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