When you are importing your sources, you'd select specific parts of the ISO.
For your purposes, you'd select the folder called "sources" within the Windows 10 ISO and not the root of the ISO.
You will need to roll out the NBS to at least one site server to be able to utilize PXE or BSDP.
The process of importing your source files is typically done only once or when you get a newer version of your sources.
When you are installing ITMS/CMS/SMS, and you plan to use DS, you will need to import a preboot environment (PE). Once it is imported, creating the PE to be delivered via PXE is a simple process, which I will explain further in this post. I will assume you haven't imported a PE.
You will need to perform this step while logged onto the Notification Server (NS).
Open the Symantec Management Console as an admin.
From the Setting>Deployment>Manage Preboot Configurations you may see a message stating that you need to import WinPE. (ITMS/CMS/SMS only distributes a linux preboot environment. Microsoft longer allows us to distribute WinPE directly with our installer.) If you have not imported WinPE, you should see 2 messages at the top of the window. You would start with selecting a version of WinPE that you'd like to use. For your case, you'd select WinPE5 - this will work with Windows 10. Once you do, you will have a link that will direct you to install the appropriate version of Microsoft's ADK using the options noted in the message in the yellow box (Deployment Tools and Window Preinstallation Environment). As you are downloading and installing, close the Symantec Management Console.
Once the ADK is installed, you would then reopen the Symantec Management Console and return to the Manage Preboot Configurations window. You should notice that the second link will now be enabled to import the WinPE environment. Click it and follow any prompts. The import process can take 30+ minutes.
You can monitor the progress of the import process by watching the Task Manager. You may notice a process called bootwiz running. It will run and close several times.
Once the import is complete, you can now create a PE for PXE.
The rest of these operations do not need to be performed from the NS and can be performed from any computer that has access to the Symantec Management Console.
Open the SMC and return to the Manage Preboot Configurations page.
Click the Add button
Give your PE a name. i.e. My_WinPE5
Select the operating system (WinPE 5.x)
If you need the ability to lock the keyboard and mouse, check the checkbox.
Then select the type of PE you want to create. If you are new to DS, just select PXE and then click OK.
As you are returned to the Manage Preboot Configurations page, you will need to click save.
Once you save, the process is then sent to your site server that is hosting the NBS to build the PE's. Again, this process can take about 30 minutes. Once bootwiz completes on the site server, you can then configure the NBS General Settings to respond to computers via PXE.