Hi @paucompany,
Thanks for the additional explanations. It is now clear what you want to accomplish.
Unfortunately, our UPS plugin doesn’t allow to use of multiple store origin addresses (or multiple collection points). This is a live rate plugin that calculates the shipping cost automatically based on the store and receiver address, shipment contents, using the UPS API, and your individual UPS account pricing.
However, a similar idea is already on the list of potential changes to the UPS plugin, so there is a possibility it will be implemented in one of the future updates.
I don’t think that, at the moment, there is any plugin (or at least I don’t know of one) for WooCommerce that will allow you to set many different collection points (sender’s addresses) and integrate the shipment with a UPS account at the same time.
As for the WC Pickup Store plugin, I believe that Multivendor Marketplace type of plugin would be more useful for you. A good example of such a plugin is Dokan: https://www.ads-software.com/plugins/dokan-lite/
Let me know If I could help you with anything else.
Regards