colourschaircovers.co.uk/web_form, can you do following, if customer only orders sash, then full payment must be paid, and so booking fee equals total cost.
Also, could you please add function to admin panel, current booking fee is 25% or £50 whichever is greater, can you please make it flat fee based on quantity of covers(field 1+field2) ordered with ability to add, edit and remove intervals please, if quantity 0-100, it is £10, if 101-200 £20 etc.
