Can I add text input boxes to sell business checks?

Hello;

Question. *Can I add text input boxes for bank routing, account numbers to sell checks? *

We sell business checks to small businesses. We have competitors that have shopping carts that sell the same brand of checks that we sell.

Here are two of them:
DLM102 Laser Checks
DLT104 Microsoft Money, Quicken, QuickBooks

The check manufacturer has a shopping cart that we use. It is a basic shopping cart. It does not calculate shipping or product totals. It is a very basic shopping cart. It does not work too good.

Shopping cart check manufacturer lets us use: DLT103 Laser Top Checks

You can use a "text" attribute in your product to get the routing number, and other text attributes to get the name, address, etc. that the customer wants on their checks.
Read the tutorials about attributes for full information. Attributes are handled in admin under Catalog > Option Names Manager, Option Values Manager and Attributes Controller.