Three Dimensional SharePoint List in Edit/Read mode

Hello all,

I am not sure if this is feasible at all but appreciate any guidance or assurance :)

I have a requirement regarding having a list which has two lookup columns. Column A, Column B and Column C

Column A is the parent for Column B and Column B is the parent of Column C.

Column A    Column B    Column C
A1                B1.1             C1.1.1
                                         C1.1.2
                    B1.2             C1.2.1
A2                B2.1             C2.1.1

We need to be able to add/edit values in the same list using (list edit mode) and not NewItem.aspx the values of all the Columns without having to edit the repeated values of Column A and B if they are the same as the previous one.

The client needs to replicate the excel functionality below:

Any input is appreciated.

Thanks,

Zeina