reuse Project

Hi bonancio -you can adjust the authorization tokens within the queries for each company’s API. to avoid rebuild the project from scratch.

you need to quickly switch between companies within the same report, you can create a Company Parameter in power query editor (Manage parameters >> New Parameters)  eg : "API Token" and use it to toggle between different company tokens. This involves setting up separate queries for each company’s data source and using the Company parameter to switch between them.

Ref: similar thread

PowerBI REST API & Access Token with Power Query - Microsoft Fabric Community

Hope the above information helps.

Hi, bonancio 

May I ask if you have gotten this issue resolved? If it is solved, please share your solution and accept it as solution, it will be helpful for other members of the community who have similar problems as yours to solve it faster.

If it hasn't been resolved, please provide us with more detailed information about the problem you're experiencing. Please be careful to remove all sensitive information and we will do our best to provide ideas for your issue.

I hope my suggestions give you good ideas, if you have any more questions, please clarify in a follow-up reply.
Best Regards,
Fen Ling,
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.