If you have a character on D4 and you want to try several builds, you should be able to go to the wardrobe and make a copy of your character. Re-specing skills and paragon should be free and specific to that character instance, this would make trying new skills and abilities better and avoid using up all of your character slots on one character type. In d3, it would take the iTunes needed for that builds and throw your other items in your inventory. I think these items should not copy over so that it does not require extra space in your stash to make it work. Or maybe give the option.
…then posting about it on the Diablo I forums is off-topic.
A simple search…
https://www.google.co.uk/search?q=diablo+iv+forums
The very first link returned…
Alternatively…
