Customize Google Sheets Invoice System

Job ID: 40126926

Budget: ₹1,500 – ₹12,500 INR

I already run my invoicing out of a single Google Sheets workbook that contains client details, line-items, and payment records. The sheet does its job, yet every invoice still takes several manual clicks and copy-pastes. I’d like you to streamline the whole flow so one action—ideally a button or timed trigger—creates a new invoice from the data I select.

The core request is automation of invoice generation. You will review the current formulas and any existing Apps Script, refactor or replace what’s there, and deliver a clean script that:
• Pulls the correct client and line-item data from the existing tabs
• Produces a properly formatted invoice in the layout that’s already in the file (no design overhaul needed)
• Runs from a custom menu, button, or trigger without breaking normal sheet use

When you’re done I expect:
1. The updated Google Sheets file with your scripts installed and authorized
2. A short comment block or separate doc explaining how to adjust key variables (sheet names, invoice template tab, next-invoice number, etc.)

If you have experience adding optional extras like PDF creation or auto-emailing with Gmail, flag that in your proposal—it’s not mandatory now but could become phase two.