B-format captures may be used to populate Bed channels in an Atmos mix. Most of the Ambisonic decoders on the market allow for solo/mute etc. of decoded components and some use of that facility has been used to both extract specific sounds from the ambisonic recording for object use and to remove dialog from the recording for background-only usage. Your ambisonic libraries make a great starting point for the bed channels of your Atmos mix.