Any suggestions for following requirements? Consider that the user is a newbie...

The user shall be able to search for all the products, by clicking on different Dropdown of a ProductSelection grid! (Category, Brand,Model,State,Year) [Products created with Ventrian Property Agent Module]

The user shall be able to add every single product , to the final enquiry grid, by clicking on  a "Add to enuiry" button. (The button could also have a plus sign  "+")

In the Enquiry grid (second grid), the user shall be able to select the StartDate and the EndDate for rental for every product

In the ProductEnquiry grid, the user shall be able to delete a product from the enquiry list, by clicking on a "Remove button. (The button could als have a minus "-" )