How to setup territory assignment with more than 3 dimensions?

Summary:

The ootb functionality of dimensions, for territory assignment, have 3 custom dimensions. We are using 2 of then, without any problem. But we have more than one business, and one of our units need at least 5 more dimensions for their territories. How can we customize Sales Cloud for that requirement. We only can customize 3 (one more than 2 already customized). Thanks in advance

Content (please ensure you mask any confidential information):

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):