The title pretty much says it all. In the previous client, I was able to make custom item/skill builds for my heroes and save them to load in games. How can I do this in reborn? Also is there anywhere to just view the items, like in the old client?
You can use this site to create hero builds once you are logged in. It is an official dota 2 site and i have used it to update my build to 6.85.
However there are some things broken, the most obvious one is that you cannot add comments to items or skill builds. But if it is only for you and a few friends then it should be sufficient until they add something more.
You can also view the items/heroes there, but there is no way to view the items in the reborn client. If you want to check items somewhere, i suggest the dota wiki. It is updated a lot and contains a lot of information.