reporting services - SSRS Color Expression Lesser than X -

i have table handles stock, have data outputting in table in ssrs can see stock levels. so:

partnumber, partdescription, qty

i can use

 =iif (fields!qty.value < 40, "red", "teal")

on quantity field set threshold within table applies every row.

is there way set unique thresholds per row (partnumber)?

if have threshold every partnumber can store in reportdatasource.

for example: partnumber, threshold, partdescription, qty

then change expression in:

=iif(fields!qty.value < fields!threshold.value, "color1", "color2")

Th