If a listing has been off market for more than 30 days, regardless of status, it must be entered as a new listing.
Here is how you can save some time by copying the old listing. Note that some fields like price, remarks and photos will not copy into the new listing.
Go to the Input tab and Click on Add new / Select the property type of the new listing (Yes Matrix will allow you to copy listings across property types!) / Click Fill from Cross Property / enter the MLS# of the listing you wish to copy (or you could search for a listing at this point) / Click the Fill From button / now just fill in the blanks of the new listing.
Please note that it is a violation of SMLC rules and copyright law to use remarks or photos from another agents listing.
Here is what the process look like: