The most common and most likely answer to this crossword clue is the 8 letter word BARCODES
I've seen this crossword clue in The Times
B
A
R
C
O
D
E
S
Buddy explains!

The straight part
We know that "help with stock control" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case help with stock control = barcodes.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 BARCODES mean?
BARCODES noun- Any set of machine-readable parallel bars or concentric circles, varying in width, spacing, or height, encoding information according to a symbology
- A portion of a gene that identifies a particular species