Hi
Do you want to upload as a one off or as a fairly regular event?
If the latter then need to ensure you do not over-write or duplicate data but if the former then it is relatively easy.
If just data tables to be imported from one to another try <File> <Get external data> <Import> or alternatively link the tables and then use a query.
If this doesn't make sense to you please come back with some more details and I will try to help further.
Best wishes
Malcy
