How to create form letters in Libre Writer

Hi There,

I’m looking to create a form letter so that I can just type in a few details, hit a button/key and have the form letter filled in.

Any way of doing that in Libre Writer?

You could create a Template. Just type your form letter, leaving blanks as appropriate, and save it as a Template.
Do you want a Macro to fill in the blanks for you? I believe that you will still need to create a Template to serve as the saved form letter.