Add Overide itext

I need to override a itext [login to view URL] reason is to change margins in each page but i couldn´t do that is the reason why im looking for help. i need to change the margins i mean margins for pages 1,3,5,7,9.... for this group margins must be top 155.95, bottom 127.6, left 96.4 and right 36.85. for the other group i mean pages 2,4,6,8,10..... margins must be top 36.85, bottom 127.6, left 96.4 and right 36.85.