Font preservation?

Hello all.  New to Adobe and apologize if the question is very basic.  I searched the community and did not seem to find any answers.  I am building a catalog, and when I copy/paste a section or clip to reword for the next section, it does bring over the existing font, etc. - but when I delete and retype the new descriptions, it uses an odd font I don't want.  Is there a way to ask the program to maintain the fonts in each section?  I didn't find an area in preferences to change the default font for this document.  Thanks in advance for any advice you can give!!