1. Highlight the vertical region that contains your formulas.
2. Do a search and replace: search for the equal sign, and replace it
with your initials. This converts all your formulas to text.
3. Copy the vertical region, and Paste special Transpoze. This
converts the vertical region to horizontal.
4. Search and replace again, but this time search for your initials
and replace with the equal sign.

When you converted the formulas to text the formulas became static. By
replacing your initials with the = sign in step 4 you converted them
back to dynamic formulas.