I have put together what I think you are asking for:

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[tbl_RM_Materials]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)

drop table [dbo].[tbl_RM_Materials]

GO

CREATE TABLE [dbo].[tbl_RM_Materials] (

[RM_ID]...