once you schedule the package, go to managment -> Jobs. Find the Job that you just created for the DTS. Right click on the job and go to the steps tab. There will be a step already in there for the data that you are transfering. Click on the insert button to insert a new step. A new step box will apear for you to enter info in. Name the step whatever you want. Fot Type, make sure its t-sql script. Make sure you select the right database. In the command text box type truncate table (and the name of the table yo want to clear). Click Apply. THen you will be back in steps tab. There are some arrows to rearrange the steps. Make sure that the truncate step is first. There is also a drop down box to where you select which step goes first.