Cenvat credit can be availed but the following points need to be noted:
You are providing taxable services and also have trading which is defined as exempted service. Therefore you would have to follow the provisions of Rule 6 of Cenvat Credit Rules, 2004, wherein you can opt from the three alternatives viz (i) maintain separate account for trading and taxable services and take credit for the inputs pertaining to the taxable service only (ii) pay 6% of the value of exempted services every month; or (iii) reverse proportionate credit every month as per the formula given in sub-rule 3(A) thereof. Option (i) i e Seggregation of expenses for trading and taxable services is an uphill task and is in some cases impractical and therefore it would be advisable to go for the other two options and the third option may be more advisable. You need to communicate this in writing to the Authorities quoting the said Rule and any mechanism once opted cannot not be withdrawn in between the the Financial Year.