Schematics and other documentation for radio boards can be accessed easily from Simplicity Studio.
Studio is context sensitive, meaning it will try to show you the relevant content for the hardware that you are working with. You can plug in your kit using USB and Studio will recognize the kit automatically. In that case, the kit details will show up in the Devices window.
Alternatively, you can manually enter the kit / radio board number in the Solutions window. Studio has auto-complete feature that will suggest you list of available options, it is enough to enter just the first part of the board or kit ID (for example, typing BGM111 will show a list of all BGM111 radio boards). This method allows you to access schematics and other documentation for kits even if you don't have the physical kit available. For example, you can check the docs and schematics before even ordering a kit.
Following screenshot shows an example how to locate schematics, assembly drawing etc. for BGM13P radio board (BRD4306A). Note that the item that is selected in the Devices or Solutions tab dynamically changes the content that is shown on the right hand side of the window.
This same method can be used to access other documentation relevant to your target hardware, including: