How do you make custom item/skill builds in Dota 2 Reborn?

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.

When you open the shop the recommended item build should automatically appear. Above this small tab is a icon for a pencil. Click on it and you can drag items into the tab under the "early, core, luxury" tabs. Remember to click on the pencil icon again to save the build.