Quartus II: how to search for a sub-function in the whole project (multiple vhd files)

Question

If I want to search for e.g. a sub-function to see where it's implemented or where the sub-function being used in the whole project (multiple vhd files), then how can I do it in Quartus II software?

For example: in Eclipse I can - "Ctrl + Left_Click" or - Right_click on the sub-function name and choose search in project etc.

Thanks