Generate a matrix from two tables and manually populate values, preserving matrix relationships if the generating tables change

[alexdi]

I'm having some trouble creating a mechanism generates a matrix I can update and tracks value pairings in such a way that new or changed data doesn't corrupt the matrix relationships.

Starting with:
Group sheet and Role sheet:

Goal:
Generated matrix:

Change-tracking:
Matrix filled:

Group AB added, Group B removed, RoleA renamed, RoleBC added:

Matrix refreshed to update header rows and columns, preserving relationships:

Non-requirements:
The matrix does not need to preserve sorting or filtering on the Group or Role sheets.
The matrix does not need to 'remember' data associated with group/role pairs that have been deleted from the source sheets.

Also:
There is an ID column on the Group and Role sheets.

I'm not sure how best to achieve this. I can generate a pivot table, but I can't seem to update the values in the generated table (PT seems to be designed for data summary rather than data entry). I haven't been able to figure out how to make a query that uses the Groups table and then adds the Roles table as additional column headers, and then properly tracks manually-entered values. I have an inkling creating a data relationship might help, but unsure how to apply that.

Is there a 'best practice' or tool I should be using to achieve this? Thanks for any advice!

 

[Fluff]

Cross posted Generate a matrix from two tables, manually populating values, preserving relationships

While we do not prohibit Cross-Posting on this site, we do ask that you please mention you are doing so and provide links in each of the threads pointing to the other thread (see rule 13 here along with the explanation: Forum Rules). This way, other members can see what has already been done in regards to a question, and do not waste time working on a question that may already be answered.