Question 1 : 

we have office in Karnataka & tamilnadu... we want to account the sales on branch wise 

Please note in purchase bill accounting there is an option : account" which can separate the bills branch wise. 

but in sales there is no option.

Question 2: 

Bills - "Adjustment" is required on bills before Total Rs.

Please note this option is available in invoice.

Question 3: 

we received payment from customer against our invoice.

invoice amount : 500000

payment receipt : 470000

tds deduction : 1%: 5000 

wct deduction :  2%: 10000 ( sales tax) 

other deduction (other charges) : 15000 (non-refundable)

how to record the deduction details