We do not know how a change in the current federal policy to permit individual use would affect GSA's ability to negotiate savings in contract airfares.
They should work on understanding how a change in the current federal policy to permit individual use could affect GSA. 
mnli hypothesis: They should work on understanding how a change in the current federal policy to permit individual use could affect GSA.  premise: We do not know how a change in the current federal policy to permit individual use would affect GSA's ability to negotiate savings in contract airfares.