What can I add to make my butter cream less sweet. I use the wilton recipe with crisco, flavor, water, merange powder. Any help would be great.

You can add salt.
The wilton bc is not the best. Search the recipe section on CC and you will find alternatives. I always add salt to my recipes since I find a lot of them sweet.
The other thing is you can also place an apricot glaze on your cake. You take apricot jam, warm it up, pass it through a sieve and then keep the glaze that is clean of lumps.
Paint it on your cake. It will solidify once it cools and it makes a great crumb coat. But it also give your cake a real tangy flavour which then also cuts the sugar taste of the bc which covers it.
Good luck
Claire

A pinch of salt is a good secret to cutting the sugary taste of your buttercream.

Try using popcorn salt.

Try the bc dream recipe and use whipping cream for your liquid...I do this and like it much better

I use buttercream dream recipe here on cc and I just don't add all the powdered sugar. It calls for 2 lbs and I only add about 1.75 lbs.