How can I customize my invoice column? Is it possible to add another column beside rate and quantity since my business needs another column to multiply with the quantity?

Hi @ly-mov-gmail-com , you could follow steps: 

Here's how:

1. Click Lists.
2. Select Item List.
3. Select the invoice template.
4. Right click and select Edit Template. The Basic Customization window will open.
5. Click the Additional Customizationbutton. The Additional Customization window will open.
6. Go to the Columns section.
7. Put a check mark in the boxes labeled Other 1 or Other 2.
8. Under the Title column, type the name of the column.
9. Click the OK button.
10. Click OK to exit.

Comment back, cheers.