[Fenris447]

Vicious is basically text-based. There's a generic version of it that exists, much like how there's a generic version of a +1 weapon. You can pull up a 'New (Copy)' of Vicious and see how it's made in the Editor. But you'll really just want to copy the descriptive text from it onto your already-made version of your weapon.

Cleave isn't built in at all. So what I would do is grab the text from that copy of Vicious, paste it in twice to the description of your new weapon, and modify the second pasted copy of that text to have all the info for Cleave.

Since Hero Lab doesn't actually play heroes/monsters against each other and isn't a dice roller, there's no need (or way, really) for it to programmatically understand things like Vicious and Cleave. That's why all of that is text-based.