Level of Effort

Hi All,
Here is another problem I am having now, need your help.

While trying to put relationship for Level of Effort activities, i can’t put same activity as pred. and succ. with SS & FF respectively. If I need to link level-3 activities with level 1 (level of effort) and there is only 1 activity in level-3, how can i change the Level-1 activity duration automatically, while changing level-3 activity duration?

Please help.

Thank you in advance for your kind help.

Thanks and regards

Sumit