It means "As it is" or, "in the quality of" Like for example, If you are a doctor. You can say as a doctor, you help your patient. Here "as a" means হিসেবে I hope you understand,

It means something like 'from that perspective'/ 'in that sense'. When based on X we conclude Y. For example, - I am living in an English speaking country for 4 years so, my English should have been fluent. - You didn't hit the car intentionally in that sense you are not guilty, but you'll be punished because you were drunk.

হিসেব means calculation/number/figure এই হিসেবে literally means by this calculation actually means by this logic/account/reason

হিসেবে means in the quality of exmple...একজন ব্যক্তি হিসেবে আপনার তাকে সাহায্য করা উচিত।

i cant type bengali.. so trying bengali phonetics... tumi onek valo porikkha dieso sai hishebe chakrita tomar powa uchit kintu tomar oviggota nai. tumi amar onek upokar koreso sai hishebe tomar jonne ai upohar khuv samanno.