Do i required cst if i purchase for the outer state and sales in local?

Dear, 

in your case the person from u r buing the goods they will collect CST @ 2% or any other rate.

When u r selling within the state u will have to collect VAT.

CST paid will be your cost of goods.

so whether i have to take CST number or not?

Please advice whether i have to take CST number or not.

If u take CST No. u will be charged @ 2% after giving ur CST No.to the seller and C form at appropriate time

and if not u will be charged at the rate higher than 2% might be 5 / 5.5 /12.5% which is highest rate in that state

Yes,u have to take CST no.

If u r from Maharashtra,find the attached CST registration manual

Thank you  but i am from Assam and want to bring gold item and acid for gold from other state for the local sale purpose.