How? Who? Why? Where? No kidding. This kind of open question is something that almost never gets the answers that are needed. Please state your problem in a clear and as detailed as possible way and I'm sure someone here will have an answer or you.
Questions that might help you are:
- what is the version of both the Excel and WinCC variant you're using?
- what exactly do you want to accomplish: amount of data to be exchanged, type and nature of the data, frequency of the exchange,...
- what have you done so far to get the result you're trying to get?
- what error codes did you receive when trying?
- ...
Kind regards,