data entry in any ecommerce addon

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Hi
Heres my thinking.
I am now building a site that will eventually use some level of ecommerce to sell services.

one service Schema Markup has 6 modules that will requires a very large amount of datd/content input by the customer to permit us to process the service request.
sometimes only 3 or 4 inputs for a module, other modules require as many as 14 inputs some being large text content like an article for lining purposes.

in mapping out the input fields normally i would end up with as many as 35 to 40 fields, a very looonnngg page indeed.

i am trying to figure out how i could use a concrete 5 ecommerce addon with a cascade page effect. line up in cascade format 6 pages, enter data in fields on page , click next OR page 2 , fill in data and so forth, but here is the catch, still need the DB to collect, process and store data and forward to us for process with the order.

Was maybe also thinking Fillable PDF doc, sent after payment via email.....

anyone with an y thoughts?

thx

blackadder