If/then Command to delete and change positions of text boxes if null

Hello!

I am trying to make a business card form for employees to fill out.  For the phone number portion there are a lot of options. Some employees have an office phone, office phone with an exstension, mobile number, and/or a fax line. 

My goal is to have it so that if a text box for a fax or mobile is left blank the text box(es) is deleted. Additionally, if an emlpoyee only has a mobile or a fax (I know it is almost 2020; who still uses fax?!) that the office phone box is deleted and all other textboxes' position is shifted up to keep with the formatting of the document. 

Any help would be greatly appreciated! 🙂