Link all the items you wish in /say and it will create import string after you press enter.
People will see your /say message with the item links but this is only to help parse the item ID's
You can keep adding items to the list by linking more items in another /say message.
It will detect all the item id's added and make sure that they are all unique.
Press the Clear button to reset the list.
The command to open this window if you close it is /tsmi open