Hi Luis_Glez ,
So, if I understand you well, you have a product with linked BOMs, and you want to manage the stock of the product and all of the BOMs except for the sticker. Am I right?
That is not possible at this moment, sorry. A product must have all its linked BOMs with the managed stock option active to get the calculated stock.
We're working on some changes that will allow additional costs to be added to the BOM tree. These changes will probably meet your needs. Unfortunately, I can't give you an ETA for this.
Meanwhile, you can set the stickers' stock very large as a temporary solution.