With out knowing more details about your products and how you run the business, i would say that the out of the box quoting tool in epicor can do that. you can pull in a method from an existing part to a part on the fly and then add additional ops and get an estimated cost and run times. you can then use that MOM from the quote to go to the job.
if you have a lot If-Then rules when you quote, the product configurator is an option too.