Schedule D

I received Stock from my company and sold the shares for cash.  Federal and state taxes were withheld on the Gross amount, and i received the net amount.  In past years, i reported the gross proceeds on Schedule D line 1a column (d) proceed and equal amount in column (c) for a zero net effect as the gross proceeds when i received the shares were taxed by fed and state.  Schedule D form does not allow me to make a direct entry on line 1a, so how do i do this.