When drawing a new dimension entity, click Pick in the Dimension Bar to copy dimension settings from an existing dimension entity.
You will be prompted to:
Indicate dimension entity from which to pick dimension settings.
Click on an existing dimension entity in the drawing.
The current dimension style, as displayed in the Dimension Bar, will be set to that of the indicated dimension entity.
The colour and dimension settings of the dimension you are drawing will be set to those of the dimension entity you indicated.