how to read subtype

hi gurus,

i am new to infotype and subtype.

i have following requierement and needs your help.

thanks for the same in advance.

1) I have to read subtype stat. (how one can read a subtype please let me know it.)

2) then i have to delimit the same(subtype stat), to same date.

3) I hav being ask to use function module HR_INFOTYPE _OPERATION.

I have no idea about it, help me with this.

Thanks.\

Adi.

Point will be surely awarded.