Can I put the same monster from the monster manual in different folders?

Hopefully someone will understand this but I have set up a Curse of Strahd game for my players and have created folders for each location such as village of borovia, krezk, castle strahd etc. My problem is I added the monsters to the folders so when we are somewhere it is easy for me to drag and drop but I can't get it to have the same one in two different folders. So lets say in Borovia I have a vampire spawn so I have the vampire spawn in that folder to drag and drop and click for the character sheet. Then I also have a vampire spawn in castle strahd. How do I get it so I have that same drag and drop clickable option in the other folder?

You can, but that's going to increase the amount of stuff your campaign has to load, making it run slower.

How would I go about doing it?

It figures after a while of searching I ask a question then randomly try the duplicate button and it did what I wanted.

You can achieve this with a lot less system impact by having a token page. Make a fairly large blank map. Drag tokens for monsters onto it and group them by location. If you have a Villager in Borovia, and one in Krezk, put a token for each in that group. Roll20 doesn't care as much if you have multiple tokens of a character, it's multiple character sheets that drag your system down. Then you can grab the characters for a location, and then copy and paste them to the needed page. This can actually be quicker than arranging multiple copies in journal folders if you have to place a lot of different characters at once. It also has the benefit of only needing to update one copy of a given character. That way, if Van Richten uses a scroll of raise dead, you don't have to mark it off on multiple sheets. Three! Three bonuses! Ah-ah-ah!!! <cue thunder and lightning for vampiric counting>