Multiple Paths

When the Extend All Selected Open Paths preference is enabled, all selected open paths will be simultaneously lengthened or shortened, in addition to the path under the cursor. Unless randomization is being used, the amount of lengthening or shortening is the same as the dragged path. When randomization has been enabled with the Q key, the values for additional paths are randomly changed by an amount up to the maximum random variation value, which can be changed using the O and P keys while dragging.

Extend multiple paths randomly