LTCG exemptionss...

Please mention the jurisdiction of the abovevtransaction.

This has taken place abroad.

So Indian income tax act is not applicable.

Indian Karnataka 

It's in Karnataka.

If my capital gain is (34 lakh -28lakh)₹6 lakh 

Whether i can reinvest only ₹6lalkh under section 54 and use balance amt for other purposes 

Which balance amount, you are suppose to use for other purposes?,( because entire Capital Gain is  6 lacs )  please elaborate your  query in detail  . 

Yes .

Sale consideration.                           ₹ 34lakhs

(-)Cost of acq.[1990].without index ₹ 1lakh

(-) Cost of improvement(building construction cost on selling prop.) ₹27lakh

Therefore, total captain gain          = ₹6 lakh

(-) Section 54 exemption.                 ₹6lakhs

                              Therefore net cg = nil

So only 6lakh in have to reinvest on residential property?

yes. you need to reinvest the capital gains portion only. Please ensure that you have aportioned only 25%of the cost of land to this transaction.

Actually we will reinvest more...more than 6 lakh can we use for other purposes???