You can override the current dimension style while creating a dimension by entering the name of any dimensioning system variable at any prompt. In this example, the dimension line color is changed in this way. The change affects subsequent dimensions you create until you make another dimension style current.
Command: dimlinear
First extension line origin or ENTER to select: dimclrd
Current value < 4 (cyan) > New value: 5
First extension line origin or ENTER to select: Specify the first extension line origin, or select an object to dimension