I don't think you will find anything that helps if this is not a kitchen, dining room or bathroom. AS a design issue this should probably be a dedicated 20 but I fail to see a code requirement for any receptacles at a wet bar. If they do put one in it has to be GFCI
I've always gone by 210.52 and it's various sub-sections, in the assumption that the wet-bar will require appliances such as blenders, etc., similar to a kitchen counter top. One circuit is usually acceptable however. GFCI protection on all outlets is definately a must.