Custom fields limited way below the 44 allowed

Custom fields limited way below the 44 allowed

HI,

We are using custom fields for our estimates and invoices. We can add up to 44 custom fields, but we can only add:

- 5 dropdown fields
- 2 checkbox fields

We are using prefilled variables so we can fill out estimates and Invoices with just one click.

What is the way to increase the number is these fields... this is very limiting for us.

Regards