Multi-Manufacturer UPS Shipping?

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We have an online store that sells products from 4 different manufacturers (the locations of which are products will ship from).

We want to use the UPS Shipping Module to calculate shipping costs for our four different manufacturers but currently, the UPS module on Virtuemart only allows for one 'ship from' zip code, whereas our products will need to ship from as many as four different zip codes when ordered from our website.

Does anyone have a fix for this? Or at least has anyone else come across this obstacle?