It's not clear how you want the cascading select to work? You need 2 questions, with the options shown for the second question dependent on the answer from the first. A classic example is "What state?" and then asking "What city?" but only showing an option list of cities inside of the selected state.
For your example you might have "Select all asset classes" and then asking them to select all items but only showing the item options that match the asset classes they selected.
Select all asset classes:
Office equipment / Machinery / Kitchen equipment / Furniture
Select all items:
Paper shredder / Water dispenser / Planter / Generator / Microwave / Gas cooker / Chair / Desk / Table / Cupboard
- Select all asset classes:
- Select all items:
I think you might need to use XLSForm in order to implement cascading selects.