Whenever the President determines it to be necessary for the purposes of this chapter, not to exceed 10 per centum of the funds made available for any provision of this chapter (except funds made available pursuant to subpart IV of part II of subchapter I of this chapter or for section
2763 of this title) may be transferred to, and consolidated with, the funds made available for any provision of this chapter (except funds made available under part II of subchapter II of this chapter), and may be used for any of the purposes for which such funds may be used, except that the total in the provision for the benefit of which the transfer is made shall not be increased by more than 20 per centum of the amount of funds made available for such provision.