How Promotions can be added in Marketing campaign

[Ajey]

Hi all, there is a service called "addPromoToMarketingCampaign" in campaignServices.xml ut none of the places in Marketing module Promotions are visible. Where we can add/remove promotions for a Marketing campaign and how do we track the usage/applicability (like how much sales went on through which promotion and all) of a promotion in a Marketing campaign. Please help me in this concern. thanx