Selecting multiple edges for a round results in multiple round sets by default. Pressing CTRL and selecting multiple edges results in a single round set.
Task 2-4. Create a round, experimenting with single and multiple round sets.
Start the Round Tool from the feature toolbar.
Select the left edge shown in the following figure, and drag the radius handle to 1.
Select the right edge, and drag its radius handle to 2.
Notice the second round set is independent from the first.
Two Round Sets Created
Select the Sets tab in the dashboard. Notice there are two sets created.
Right-click on Set 2 and select Delete. Press CTRL and then select the right edge again.
Notice how now there are now two references for Set 1 in the Sets tab.
Drag the radius handle on the model to 4.
Notice how both rounded edges are now linked to the same radius value.