Aggregation Level issues

Dear Experts,

I have 2 questions about aggregation level now.

1) I have deleted an Aggregation Level in Planning Modeler But it's not being deleted from the InfoArea of

BI Modeling section. How do I delete it from InfoArea ?

2) Currently that Aggregation Level is based on 1 InfoProvider.

How do I add another InfoProvider under that ?

Or how do I delete the existing one and replace it with a new one ?

Thanks,

Akash