Method of manufacturing electronic devices using a maskless lithographic exposure system using a maskless pattern writer, wherein beamlet control data is generated for controlling the maskless pattern writer to expose a wafer for creation of the electronic devices. The beamlet control data is generated based on design layout data defining a plurality of structures, such as vias, for the electronic devices to be manufactured from the wafer, and selection data defining which of the structures of the design layout data are applicable for each electronic device to be manufactured from the wafer, the selection data defining a different set of the structures for different subsets of the electronic devices. Exposure of the wafer according to the beamlet control data results in exposing a pattern having a different set of the structures for different subsets of the electronic devices.