This really goes to your analytical strategy. Technically, there is no problem coding to the same nodes and having common and unique codes for both data sets. Or, initially separating them using folders and bringing them together later in the analysis. Nor is there any problem with having separate demographics. However, what you definitely don’t want to do is start another project file. We only need one database for the project regardless of how many sub-sets of data it contains. This is fundamental to optimising your data.

Kind regards,