The political role of NATO runs across the whole alliance, on the military side and the civilian side. For instance, the Supreme Allied Commander Europe has a diplomatic role, as does the commandant of the NATO Defense College, and so on. The political work is supported across the budget of NATO. There's also the public diplomacy section that engages directly in public diplomacy, and they have a budget line item inside NATO as well. Then there are partnership activities that are partially funded by allies and partially funded by the alliance. These help spread the news among NATO's 40-plus partner countries about what NATO does and also help build awareness and capacity.
I don't know if I've answered your question.