If the invoice print preview in BUSY does not show the description you have entered,you can follow given steps:
Step 1:Go to Administration menu,
Step 2:click on configuration,
Step 3:Click on voucher series Configuration,
Step 4:Click sales then select series,
Step 5:Then click voucher configuration enable Here Item-wise Description,specify Y,save this window,
Step 6:After that,while entring a voucher you can see item wise description window, here you can mention your item description,then save and print, Description will be automatic shown in your printout.