It depends where they are registered at whether there are bulk tools to enter the Sedo verification txt code to many details at once. For example, Name.com do have a bulk tool where you can enter it to all the names there at once, but as far as I know a number of other registrars do not.
If you mean can you enter various txt verification codes for different marketplaces, the answer is yes, technically, you can have multiple TXT records. However, as far as I know the other main places do not require them. DAN have a verification now, but it is a bit different, operating as a DNS rather than a TXT record.
When setting TXT records for Sedo I find it works smoothest to first set the txt record at your registrar, keeping the default DNS settings, at the registrar, and then list the name on Sedo. When I do them that order they usually verify within a minute or two.
Once they are verified for Sedo, you can then set the DNS pointers to whichever one place you want your landers at.
Note that some of the brandable marketplaces do not allow you to simultaneously list anywhere else. Check the ToS. But Afternic, Sedo, DAN do allow you to list at multiple, as long as you remember to promptly disable the listing at the other places when it sells your you get an offer.
Bob