Using Cosmetic Bones
In Black Ops 3 we have now have joints classed as "Cosmetic" which are seperate from the 255 bone limit Black Ops 3 imposes.
"Cosmetic Bones" are usually bones that define face features or small cosmetic features on the model. If you're porting from Black Ops 3, cosmetic joints are usually obvious, as they are a large number of joints with no children parented to 1 joint, for character models for example, this is the joint "head"/"j_head".
All cosmetic bones share the same parent, and thus it is easier to mark 1 joint as the parent and everything under that joint be cosmetic, to do this:
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Select the parent of the cosmetic bones.
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In the export window select "Set selected as Cosmetic Parent", CoD Maya Tools will tell you it's been marked.
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Export as normal.
Cosmetic Bones cannot have children and there can only be 1 cosmetic parent.