I have created over 60 business letter templates with slight variations in each depending on a variety of situations.

Is there a way that I can have one template but select off a menu the various content elements I need and have the text inserted into the letter?

The letter will need to be editable and also has some mail merge.

The answer is almost certainly yes. You could employ a userform to select the variations ane write them to various parts of the document, or as you have already gone to the trouble of creating the templates, you could add a ribbon tab to the ribbon with a menu system to call the required template.

Mail merge may create some issues in this context, but probably not insurmountable ones. We would need more information.

Start with http://www.gmayor.com/Userform.htm and http://www.gmayor.com/Userform_ComboBox.html

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Graham Mayor - MS MVP (Word) (2002-2019)
Visit my web site for more programming tips and ready made processes www.gmayor.com

What do you think about Content Controls? Does that do the same thing?

Ahhh.... no.

For someone without programming experience, userforms can be daunting.
It is the most elegant solution to what you are trying to do, though.

A much more complex solution would not require macros. You would need ASK fields combined with IF Fields. This is more painful to use because there will be a series of ASK response boxes popping up. This is still a type of programming, but it is all done within the Word document. It does not give you a menu, it gives a series of questions. IF fields are case-sensitive in their tests. The ASK field predates Windows and is not fun.

I recommend biting the bullet and using a UserForm.