In the instance where there is an agency with multiple offices but only one uploader account, the admin access can delegate which listings go to which agency.
This can only be done by a user with admin access to both agencies. Log into the agency that has their data feed set up and click into the Sales tab.
Under the Sales heading, click into Listings. Find the Listing you wish to allocate and Click the ... button, followed by Change Agency.
You will then be prompted to select what agency you wish to allocate the listing to. Select the agency and then confirm. This listing will then appear on the Listings tab on your chosen agency.