I have a virtual document that contains three child documents, one of the child documents if fixed to the baseline version 1.0, the other two are not fixed to a version. If I understand correctly, I should be able to choose the version I want to include in my snapshot for these two documents, though I see no way to do this and can't find any reference to it in the Webtop documentation.
Update: Perhaps this is only available with conditional assembly? However, I can't find any way to do conditional assembly within Webtop 6.7 SP8