Follow Mr. Rigby's advice.
Further, the Plan Administrator holds the reins, the tiller, whatever. The Plan Administrator decides if the DRO is qualified.
If there is an ambiguity in the DRO or if a needed factor is not specified, the Plan Administrator can send a letter to all parties stating how the Plan will treat the ambiguous or missing parts, subject to the parties' agreeing to the points in the letter. Some will say that the Plan Administrator should not get involved and should simply reject the DRO as not being qualified, but sometimes the process moves along faster if the Plan says here's the problem and here's how we are going to do things if all of you agree. (And some of us PA's prefer not have DRO's hanging out there for an extended period of time.)
If the parties do not agree on the points in the letter, then the parties can try again to generate a DRO that eliminates the ambiguities, so that DRO is qualified and fully instructs the Plan Administrator on how to do the division of the account (within the rules governing QDRO's). At that point, I'd leave it entirely up to them to work out the necessary details.