Robot lets you apply a variable section to several bars that form a chain. To assign a varialble section, specify the parameters of the section (dimensions at the start and end of the bar) on the Tapered tab in the New Section dialog. Next, in the Sections dialog, specify the (chain of) bars to which the section is to be applied. You can do this 2 ways:
In the dialog, you can define how you want to assign the section to the bars. At the top of the dialog, a question displays whether the section is to be applied to the chain of bars. There are 3 ways to apply the section:
Clicking Apply assigns the variable section to the selected bars.