What I think is happening here is that you have polygons of territories (franchises) and want to assign (using spatial intersection) base features to the territories. We don't support this case directly in Territory Design. So the TD tools can't do it directly, but it can be done using core tools and result is used for Territory Design.
If that's what is happening then Spatial Join will help. Here's two ways you can go...
(1) Join Franchise records to ZIP records. The resulting table can be imported to a territory solution with help of TD Import Territories wizard.
(2) Join ZIP records to the Franchise records, if you want to summarize some demographic attributes of ZIPs and add the summaries to the Franchise records.
More info on Spatial Join is here: Spatial Join—Help | ArcGIS Desktop