I am seeking help designing function or macros that will perform the following task:

Allow a user to select a specific base model non living quarter trailer and have a function input the price in the blank cell under list price. I would like this to be as simple for the user as possible. I would like the user to click on the corresponding cell to whatever trailer that they desire, and have the function or macro input directly into the blue cells near the bottom of the page. If anybody that can come up with something that would work to complete this task, that would be great. If you need more information, just let me know.

Thanks