Want to update the Customer information in account for the category manager fill

Summary:

The client has requested an update to the Category Manager field for accounts where customers were created manually. Is it possible to update the Category Manager using the FBDI template?
if possible than which sheet need to be fill and what source need to be use.
Thanks

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):