Extrude join the font on the surface of a body, sketch bridges, extrude cut bridges (R) to surface of the body, then extrude cut the font through the body (first A)
Probably true with most programs but for every problem in Fusion 360, there usually a number of ways to solve it. That lends to be both “the beauty” of it and “the curse” for new learners.
If you do a lot of things with fonts, you might find this topic, from Craig, of interest:
As the name suggests, he shows you how to make your own personal font with bridges already in them. It was during this exploration that I happened on to this use of the NON-exploded font. I had worked for a number of hours (I was really slow…faster now) and when I exploded the text, Fusion 360 would have problems with it. I basically would have to re-work many letters. I had seen something on one of Tin’s videos that gave me the idea that if I could select something, like the unexploded text, I could use it. And it worked.