Brain Game: Really Built
By BY

Today's Brain Game starts with a single letter of the alphabet and builds into a seven-letter word. You'll accomplish this by adding one new letter of the alphabet to the mix with each entry, and (if necessary) rearranging the existing letters, to form new words. (Example: I -> IN -> NIP -> PINS -> SPINE...) Good luck!
1-letter word: an indefinite article2-letter word: Charles to Half Pint3-letter word: not quite a hat4-letter word: guitar helper5-letter word: not quite a rooster6-letter word: it's over your head7-letter word: regular business
Here is the SOLUTION.
THE SOLUTION:
A -> PA -> CAP -> CAPO -> CAPON -> CANOPY -> COMPANY