Dimensioning is the process of adding measurements to a drawing. Tolerancing is specifying by how much a dimension may vary.
The dimensioning system variables control the appearance of dimensions. You can set these variables on the command line or through the Dimension Style (DDIM) dialog boxes. You can manage all the dimensioning system variables quickly and easily by setting up dimension styles. A dimension style is a named group of dimension settings that determines the appearance of the dimension.
Dimensioning Concepts
Creating Dimension Styles
Modifying Dimension Styles
Setting the Scale for Dimensions
Creating Dimensions
Modifying Existing Dimensions
Adding Geometric Tolerances