Add the ability to set a parent company for individual business locations

It would be helpful to those nonprofits who receive donations from local stores to be able to link those stores with their parent company. That way, we could easily see the overall donation data for a company, while still being able to credit the individual business location that donated.

For example, my nonprofit receives in-kind donations from stores of a grocery chain. We would find it useful to be able to credit the specific store that used their allocated donation funds on us, while being able to see the grocery chain's overall donations from all stores.