forms for CPTs

Hi,

I have set up my directory with about 8 Custom Post Types and each of these has custom fields specific to the category (i.e. the CPT kids classes has different custom fields to what appear in the CPT photographer), but I’m now not sure how I can monetise that simply enough.

If I were to strip away the CPTs and just have all the businesses listed under the one CPT is there a way the form can then be tailored to separate categories? e.g. I would want a gym listing to outline how many children can fit in their creche, but this question is obviously not necessary for a local photographer listing.
Does this make sense?
Thank you,
Katie