I can the “acronym” column, if it is empty I need it to bring the number 2 and if it is filled, bring the number 3 in a new column.
Can you proof read your post again and make it a little bit more understanding regarding your input and expected output? What is “acronum”, I see SIGLE and PARAD. What is number2, second row to a new column?
It sounds like Missing Value node with next value for that column but that’s a wild guess.
People are more likely to respond to a well constructed topic. Remember what I said earlier about using generic titles all the time 
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Your words do not map your screen (at least to me) but try Rule engine with missing for your issue
(There is also a forum guidline on how to write a good topic as far as I can remember)
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