On a site you manage there is a contact form that works well for the...

Add "Retail Sales" and "Business Sales" categories to the contact form, and set up a Recipients list for each category

Add a new contact form for Commercial Sales inquiries, and update the Recipients list for each form to send submissions to the right people.

Use an add-on module like Webform. since Core doesn't offer this feature

Since there is only one Contact form, create a Content type with fields to collect the information Commercial Sales needs, and set permissions to allow anonymous users to create content