Set extension lines

Annotate tab > Dimensions group >  Define dimension overrides menu > Set extension lines, 'DIMOFF

Define the settings of the extension lines. This function will define a dimension override to the current dimension style.

Enter extension line offset from the dimension point, or the length of the extension lines.

The DIMOFF will set the value of the DIMEXLINEE system variable. When set to a fixed length, the variable will be set to a negative value. The program will then understand it as a fixed length instead of an offset.