Click the Create
Dimensions icon 
on the Symbols toolbar
or choose the Symbols / Dimensions
from the main menu.
Place the cursor over the first point to be picked which is automatically marked with a green square.
Pick the first point.
The Linear Chain option allows you to measure a series of individual linear dimensions in a sequence.
To create a linear chain:
Click the Create
Dimensions icon on the Symbols toolbar
or choose the Symbols / Dimensions
from the main menu.
Place the cursor over the first point to be picked which is automatically marked with a green square.
Pick the first point.
Pick the second point then pick outside the figure to create the dimension.
Place the cursor over the dimension and right-click to access the Interaction Dialog.
Click Chain Dimension (the cursor changes to the Chain Line Dimension
pointer 
) then pick sequential points in the chain while
exiting between each picked point.
The linear dimensions are created and aligned in a chain. If any of the dimensions in the chain are moved about the graphic area, all the dimensions align themselves accordingly.
Edit its parameters with the help of the hot spots
and tips either directly in the graphic area or on the popup menu. Change font style 
and character size also, if required.
Exit twice to leave the function.