As per you said you are using the tally software for accounts. i dont thing so, it is not possible to record the entry.
In purchase vourcher, select the supplier name in party a/c name column
and each item of product and its name in the item side,
after the all the items show the, if the cursor last row of amount column, please press the enter twice, now you will reach ledger name taken area. please select the CENVAT Receivable account and so its percentage or amount. and next row show the CST Receivable account and put the amount. (please set these ledger as inventory affect, by this we can get this amount are affect the cost.) and save the voucher.
You can set the cenvat ledger under as direct expense or current asset...if we show it as a direct expeses we need to trasfer that to asset account