Is it possible to create custom emails, depending on a fields answer.

My question is related to being able to have a field selected.

ie. Inquiry, Complaint, Reedback. and only showing the field's that relate to this.

With this is it possible to split this into the three forms if a person selects all and sent to different emails.

You do not need to split the original form into different ones, you may simply show the needed fields based on the selection the user made, the guides below will help you doing that: 

https://www.jotform.com/help/316-How-to-Show-or-Hide-Fields-Base-on-User-s-Answer

https://www.jotform.com/help/297-Show-or-Hide-Multiple-Fields-at-Once-Using-the-Section-Collapse-Field 

You may also create different email notifications and send them based on the selection as well, please check this guide in order to get more details about it: https://www.jotform.com/help/167-How-to-Send-Email-Based-on-User-s-Answer 

I hope this helps.