I had two coupons, one from each newspaper I subscribe to. JoAnn's let me use both when I questioned why should I subscribe to two newspapers if I can't use all the coupons. I won't do it again now that I understand the policy, but thought the lady was really nice to let me use it.
They are very generous with the use of coupons at my JoAnn's. Six with different bar codes would be fine. A coupon at our store is per cut which as mentioned could be an entire bolt.
At one Hobby Lobby they will mark fabric on 30% sale at the full price so you can use your 40% off coupon. Wow! That is customer pleasing!!!