Method 1: Global Linear Thickness
First is through the global setting that you would assign at the start of a takeoff (does not work well on existing lines though). This allows you to set a global thickness for all of the Linear takeoff items that you place in your sessions going forward.
Keep in mind this only remains for the QTO session and will need to be set again. It also does not affect items that have already be placed in your session.
Method 2: Individual Linear Thickness:
Method 2 allows you to assign your line thickens to the individual takeoff items from the Takeoff Palette. I actually prefer this method because it give you a little more control over the width of the line and you can put this information your QTO Catalog, but it might require a little more setup.
Now the new Thickness is assigned to the Linear takeoff. You could essentially repeat this process for the remainder of your Linear takeoff items and vary the thickness as needed.Original: Quantity Takeoff: Adding Line Thickness to Linear Takeoff: "