Overall Drafting Standards and Base Detail Standards
You can specify an overall drafting standard that provides defaults for all detailing options. Overall drafting standards apply to all detail settings unless you derive settings for a particular set of details from another base detail standard.
For example, all detail settings derive defaults from the ANSI standard when you set the Overall drafting standard to ANSI. Diameter dimensions derive default settings from the ISO standard when you set the Base diameter dimension standard to ISO.