Promotion activity could be geared to reducing the seasonality of demand
on the constraint resource. You may initiate promotions on products that do
not cross the constraint and thus consume excess capacity. Promotions have
the benefit of being short term, and thus do not commit you to the risk of
a permanent price reduction. However, they have the drawback of creating
peak demands on manufacturing resources, which increases the risk of reducing
delivery performance. Your decision on the location of the constraint and
where it is now vs. where you want it to be should influence your product
promotion efforts.