Possible to load respondent data (eg, age group) AFTER the survey emails have gone out?

Is it possible to load respondent data (eg, work department, gender, age group) AFTER the survey emails have gone out? I know that it is indeed possible to load additional fields e.g. department, gender, age group, that could then be reported on using the Qualtrics reporting tool. The basic info I found gives an example with 3 additional fields but I guess there could be considerably more (is there a limit?). With this loading WITH the email addresses the additional data fields can then be reported against. For example you could have report by age group, department or whatever. I am not sure but I suspect you could report by any combo of 2 or more of these. Key here is that this additional data needs to be uploaded with the emails ie. BEFORE the emails are sent out. But is there also a means of uploading details that would allow for reporting of survey data in Qualtrics against data loaded AFTER the email shot. I mean, in effect, standard relational database cross-referencing. There is an element here I guess of users being able to treat Qualtrics as something of a data warehouse ( if this is indeed possible) but for many reporting users the alternative would be too much a stretch. I guess if the answer here is “No. Sorry not possible” then the key is to ensure as much as possible that additional data is loaded with the respondent email upload.