Creating Dimension Styles
To create a family member dimension style
- From the Dimension menu, choose Style.
- In the Dimension Styles dialog box under Dimension Style, select the dimension style for which you want to create a
dimension style variation.
- Under Family, select the type of dimension (family member), and the style variation.
- Select linear to apply the variation only to linear dimensions
- Select radial to apply the variation only to radius dimensions
- And so on
- Make the dimension style modifications by choosing Geometry, Format, or Annotation.
- In the Dimension Styles dialog box, select Save.
- Choose OK.
The family member dimension style is saved. When you next open the Dimension Styles dialog box, the Parent dimension style is selected by default.
Dimension toolbar: 
Command line equivalent: DDIM