Are you merging salesforce, excel and SQL Server into a single Cube? If so you need to build star schema where you have a common "Company" dimmension that aplies to all of your data. You probably have some other common dimmensions like date.
If they are in different cubes you can still solve your problem. All of the cubes need to have common Dimmension. In your example a "Company" dimmension needs to be created in each cube and have the same fields that you want to filter on with the same names. That would allow you to filter on Company Name, Comany ID, Company Type, etc.
Sisense has good training on Star schema design.
If you don't know about dimensional modeling and star schemas this article should help https://www.guru99.com/dimensional-model-data-warehouse.html