It must be work!
alls
cm,atmp,area
asel,s,,,1,5
cm,a_save,area
aatt,,100
aovlap,all
asel,s,real,,100
cmsel,r,a_save !-> unmodified input areas
asel,inve
cmsel,u,atmp !-> new areas
May be ANSYS destroy components during the boolean operation. hmmm. There is an other way to save...