It is not possible to change Design Method / Local Load Method for Bracket support calculation. Only PD 5500:2015 G2 is still predefined and there is no possibility to change the calculation to other codes.
There is an issue in the UI about the Brackets (Support Properties Dialog). Only the last commercial Release is impacted (CE Update 4 - v40.04.00.08). It is not possible to change the Local Load Method for Brackets (logged under Defect 745443).
The only one workaround is to open the EMVD file with a text editor (e.g. Notepad) and then find and replace these 2 values under <VesselSupport>:
See the following list of values XX and YYYMM for each method.
This issue will be fixed for the next Update.
Note: When a new model is created, data that need to be manually changed are not written, so tag must be added also.