Get Relative File Path Of Workbook

I work on multiple workbooks. They all calculate a lot of functions and I am forced to create multiple workbooks to do these calculations. Linking to other workbooks basically displays the results of workbook1 and works from there.

But...

I need to keep an overview of these files, so I store them in different folders all within the same 'master' folder. So let's say: master folder is FolderMaster, and this contains folderA, folderB, folderC. FolderA contains workbookA1, workbookA2; folderB contains workbookB1, workbookC2 and finally folderC contains workbookC1 and workbookC2.

Suppose that this hierarchy might change. Moving eg workbook A2 to folderB. This would cause a #REF if it is linked in another workbook.

So I thought: organize your hierarchy in a 'master workbook' and store all paths to the individual files in a worksheet. If I link to a specific folder I do not directly link to the actual folder, but would use INDIRECT and grab the filepath from the masterworkbook. If the path to a workbook change I do not have to update all individual links, but only change the path in the masterworkbook. Right?

But 'how' is the big one here. How do you formulate your path to a file? It can not be the entire file path since that's variable... (sometimes 'hd:User1:....'; sometimes 'HD:User2'..."). So I think I need something as mentioned in this office help thing. But I have no clue. I do not want to use VBA, I hoped for another solution to this.