Is it possible to have in AutoPipe Vessel different standards for projection nozzles (for example, standard from Technip, standard from other engineering companies or clients...), so that you can choose the desired standard with one mouse click?
No, currently it is not possible to have multiple defaults for nozzle projections, only one value can be set (both for US and SI) in the defval.doc file in the config folder as shown below.
Nozzle and Flange design
Bentley AutoPIPE