the following forum discussion explains how to do that:
Entering manually isn't really very hard or time consuming but the key thing to remember with Geni is that it is different to other sites. There is a good chance that you won't have to add your whole tree because it may already exist on Geni. I suggest you search for some of your family names and see if you can find any branches of your tree already on Geni. If you do then you only have to add on to what is already there.
It's up to you, of course, David, but there is also the possibility that you have something wrong. The data that has sources can be backed up with these sources and citations so if your sources are strong others will benefit from your work and be able to correct their 'wrong' information but it works both ways. someone else may have sources that you haven't seen yet and you may benefit from them. As I said before you possibly won't need to enter all 4000. I have entered all of my profiles manually and I have over 5k,
Well its possible that I have some information wrong but that is where I need to verify with the sources. And yes In the end I will have to verify all duplicates one by one, but at least I know I am not letting in incorrect data. I have information on Ancestry.com and a lot of the people just assume that data they are being matched with is correct.
In any case I will only enter basic information and see how things go.