A typical parastatal has training allowances and other useless staff costs that are higher than the basic salary, they need to focus on this cost, my bet is they can claw back upto Sh100B by simply eliminating this cost.
I have never undrstood why gava/parastatal employees need to leave their offices (which are generally 3 times the size of those in the private sector) go to a hotel accross the road to brainstorm on a task they should be doing on a day to day, and then procced to claim all manner of allowances.
They should also think of paying a basic salary at market rate and peg it to delivery of services, they can then do away with house allowance, extraneous allowance, responsibility allowance and whichever other allowance they pay to justify using up the budget.
"The purpose of bureaucracy is to compensate for incompetence and lack of discipline." James Collins