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Build lightmap with required objects in scene
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Duplicate the generated lightmaps
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Goto Windows->BeastHelperPlus
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Click on "Read Current Maps"
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Click on "Store Maps info to Disk"
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Do the above procedure for all different cases of scene partitioned lightmaps
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Make sure to clear lightmaps before baking new partition
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After Saving lightmaps now it is time to load them
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Click on BeasHelperplus from step 3
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Click "Load maps info from Disk"->Click on First lightmap->Select Replace(Do not select merge as this is our start point of lightmap merging)
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Set lightmaps repective files in editor
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Click Set Actual maps in Beast
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Now repeat the procedure but only instead of repleace you will have to merge
#Note: While loading map info turn off the baked lights as it has been noticed the light becomes too bright