Create Invoice with Multiple products

Create Invoice with Multiple products

I have a trigger action of Create New Deal. When it is created, in Zoho Flows, I evaluate to see item A in the deal is true. If it is TRUE I want to add two specific items/products to the Zoho Invoice instead of 1. The two that I need is a combination of two fields that are populated in Zoho CRM deals. The values will be the same name in the CRM as the Items/Products in Zoho Books. How can I accomplish this as the Zoho Flow only lets me put in one product for the Item. Is there a custom function I can create to just call 2 values from the CRM and combine them together so that when I create the invoice, both items are on the invoice?