Excel support

I have an excel document that I've created to track stakeholder engagement. On the second tab "tracking", I would like to be able to have cascading drop down menus... for example if in column C7 I choose Appian Capital Advisory, in cell D7 it will only show me the names for individuals who are from that company. These should pull from coluns D and E in the Mapping Tab. I would also like to add a fourth tab to my excel that maps on a 4x4 matrix the results from column H and I in the mapping tab. I would like to be able to filter that matrix based on stakeholder category (i.e., column C)