This will be in basic a 1 page form.
This form will be pre loaded with details from a MySQL database (After login).
The company can login and will be show details from de MySQL database. (So the form content can be different for every company.
In these form there will be some simple calculations.
In the attachment you see a more detailed explanation of this project
There is allready a MySQL database, CSS example and an example Excel file thats shows in basic how it should work.