Combining lists

I have a Zap that brings invoice information from Quickboks Online into AirTable. Many of these invoices have multiple lines for different charges (material, labor, etc).

My Zap brings over the descriptions of the charges in one AirTable column and the charges are put into another column. I have then created columns that take this information and put it into lists.

I want to combine the two lists such that the charge ends up with its description.

For example:
Faucet: $500.00
Installation: $100.00

Currenly when I try to combine the list the result is:
Faucet:
Installation:
$500.00
$100.00

BTW - I have tried to combine the two within the ZAP itself and I get the same result.

Thank you - Stephanie