I would like users of my ad site to be able to select multiple locations when publishing an ad. Take for instance, an advertiser wants to publish an ad for services rendered in different locations of a state.E.g. XYZ Pizza shop does home delivery to locations A, B, D,K and M in State 1 and also locations O, I and D in state 2. Can it be possible to edit the OSClass codes in order to show this or would a plugin be required for this?