i followed the link and follwed the procedure described there, and thanks it seems to work. however one question... the duration of this new hammock activity remains with a question mark, which also makes the duration of the category it is under a question mark. can we get rid of this question mark and still keep the links? for instance it calculated duration as 149? days. i went to that cell and typed 149 but this caused the links for the hammock task not working anymore