I want my selection to reduce 4 mm from page size. for example my page size is 100*100mm and my design is 99*99mm or 150*150mm. I want my selection to reduce 4mm and after reducing it automatically become 96*96mm and then group everything on the current page and also place center on the page.
you can complete your task with 2 macrosjohn's item to pagehttps://community.coreldraw.com/talk/coreldraw_graphics_suite_x5/f/coreldraw-graphics-suite-x5/37805/automatic-page-fit-to-any-imge-size-or-vice-varsa/178486#178486mek's above mentioned macroitem to page with make your design size as the page and meks code will help you to reduce the size 4mm.