Though I don't have CT-Art 4.0 in front of me, I have used it in the past. There should be a tab somewhere that lets you select by difficulty (from Difficulty 10 up to 120 I think).
If it's not in a tab, check the menu at the top.
CT-ARt 4.0
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Aug 24, 2012
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#3
This is a good example of why I mostly avoid Convekta products. Read it and weep.
http://www.chesscafe.com/text/review730.pdf
Do anyone know how to get tactics by difficulty instead of mottifs in ct-art 4.0