SCCM 2016 adds boot images automatically during automatically which are based on Windows PE version from the supported version of Windows AIK or Windows ADK. Depending upon the version of SCCM, you might be able to add boot images based on different version of Windows AIK.

Every version of Microsoft SCCM supports boot images from specific versions of the Windows Automated Installation Kit (AIK or ADK).

For Detailed information on Boot images, please visit here

You can also create custom boot images with tools that include extra components and features and import into SCCM. more information is available here

For SCCM 2016, make sure that boot images are configured for PXE support.

Launch Microsoft Configuration Manager Console

Go to Software Library > Operating Systems > Boot Images

Right Click on Boot Images (x64) and Click Properties

Go to Tab Data Source

Make sure that Deploy this boot image from the PXE-enabled distribution point is checked

Go to Tab Customization

Check Enable command support (testing only)

Enable command support (testing only), will allow to troubleshoot OS deployment issues.

This complete the Boot Images configuration!