Any module could enable that the sub-category will come into the parent category？

Any module could enable that the sub-category will come into the parent category？

The example:

I have a parent category "A",and a child category "B".

-A
-B

I create a stroy,choose the sub-category "B",Submited display the tags is "B",I hope the sub-category display too,tags is "A" and "B",May realize?

Thanks very much!