How to force checkout_form.php to display during checkout.

I have a custom usergroup called Company. When someone from the Company usergroup is logged in or checks out I need to show some additional fields during the checkout form process so that they can select their rep name and select which shipping address to use (some companies have 20+ different address).

During Paypal checkout the checkout form is bypassed. I need to display the checkout form sometime during the checkout process.

Can I simply remove the Paypal button from the cart.php page and use a button that goes to the checkout_form.php page?

Then add the paypal button to the confirm.php page?

I think you can just remove it from the cart page and then take them to the checkout page, which should have the express checkout form on it as well.

Then add the form fields to: webassist/plugins/shopping_cart/pp_expressform.php

From there save them into the session and you can use the session variables to display and update the values on the pp_confirm.php page.