[mariana sussekind]"I am trying to create a multiclip sequence out of 5 sequences.
Is It possible?"
Nope. Multiclip only works with CLIPS. Not sequences.
[mariana sussekind]"Cam I sync my 5 sequences into one multiclip? How?"
Export them as self contained QT files, re-import them and use them as new source clips. WARNING, you will lose any and ALL reference to the source media. Meaning if you lose a drive, or want to revisit the cut...you might not be able too.