If you are using base-flange, then you cannot generally pattern your sheet metal specific features.
But if you are using insert-bends, you can accomplish this with ease by patterning "pre-bend" insertion (roll back before sheet metal). Additionally, if your pattern is linear and all the resulting bend panels are planar, you could combine them into a single sketch yielding multiple bends.
Regardless, you may not pattern any sheet-metal specific feature in either modeling mode. Personally, I prefer the insert-bends mode for the more open modeling techniques. The base-flange is a bit weak and there are some techniques that are prohibited. Much like boxing with one hand tied behind your back.
If you can post a model, maybe we all could give some advice.
In any case, best wishes.