The most common and most likely answer to this crossword clue is the 6 plus 2 letter word BOTTOM UP
B
O
T
T
O
M
U
P
Buddy explains!
The straight part
We know that "from shop floor to the board" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case from shop floor to the board = bottom up.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does BOTTOM UP mean?
BOTTOM UP adjective- Of, or relating to a hierarchical system that progresses from multiple, small subunits to a single, large basic unit