Brigitte,
Sort of. What we mean by that is it is a workaround that you have to do on a right side or left side basis. You cannot go from the left side to the right side and vice versa. So that said:
1) Click the round SmartDraw Menu Button and choose "Options > Allow Lines to Link"
2) Select the branch you wish to duplicate and do a Ctrl+D (Duplicate) command.
3) Drag the duplicated branch by clicking and dragging the branch connector line and drag it into position.
4) While the branch connector line is still selected click the control point where it links to the shape and drag it to the shape you wish to link it to and you should see it link.
See if that helps.
Regards,
SmartDraw Support