AutoCAD 2008 Essentials

One of the cases users may face is: You need a dimension style identical to almost all types of dimensions except for Diameter, which you want a little bit different.
In the above case, we create a dimension style for all types (we call Parent), then we create a child dimension style from it.
Follow the following procedure:
Create your parent dimension style.
Select it from the list in the dimension style dialog box.
Click the New button to create a new style.
The following dialog box will appear:
For Use for select Radius (as an example). The dialog box will change to:
Now click Continue and make the changes you want. These changes will affect only the Radius dimensions.
In the Dimension Style dialog box you will see something like:
