A method for designating TT and TB regions utilizing designated TS regions, without fully generating TT and TB features, and thereafter fabricating TS regions utilizing the designated TT and TB regions, is disclosed. Embodiments include: determining a TS having a placement and shape, the TS shape having a first horizontal dimension and a first vertical dimension; determining an active region including the TS; determining an extended TS including the TS and an extension portion in the horizontal and vertical directions, adjacent each edge of the TS; and determining a TB region based on the active region and the extended TS.