Hello Alex, No, this list is not controlled from specification, and there is no easy way to define it that way. By default, possible values for this selection dialog is stored in a drawing xdata variable BENDRADIUSLIST (what it is set for current model can be checked using (at_pipingsystem_displayvariables) command in acad command line). You can update it by using (at_pipingsystem_setvariable "BENDRADIUSLIST" " new values list ") command. For new models, it is read initially from SYSPREF.INI file, located in C:\Program Files (x86)\Bentley\Plant V8i\Piping\ folder. If you have required programming skills, you can set it up to get this list from a SPEC or some other source by customizing at_MiterElbow_Input Subroutine in input.ebs file (located C:\Program Files (x86)\Bentley\Plant V8i\Modules\Base\common). Default values for bend radius list is retrieved at line 406: Regards, Justinas
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