Table Lookup for cascading selected / Choice

Dear Respective Team,

I am new with table lookup I want to do lookup table as the following from activity_type Table.

acivity_type

  • CAMPAIGN/OUTREACH
    -CONNECTION **
    ** - MEN SUPPORT

  • WORKSHOP

  • TOT

  • GENERAL LEARNING

After I get this set in excel, in Comcare app , I build a form with Lookup table and when I click on CAMPAIGN/OUTREACH, this will display CONNECTION and MEN SUPPORT.

Note: Afterthe connection selected. this will bring another form from another lookup table

How can we get the excel done for this lookup?

Thank you.
sockea