The easiest way to handle this is to create characters for each class of monster.  You need not fill in complicated character sheets though if all you want is simple abilities.  Here's the basic process:  1) Create a Character to represent your monster. 2) Create a Token that represents your monster. 3) On the Token settings (double click it or select it and click the gear icon), set the Represents to the Character you created in step 1) 4) Set the  Values  of the bars to what you want.   Do not set Represents on them!   (This will allow them to each have their own hit-points, instead of sharing them like a PC or named NPC would.) 5) Open the Character and with the Token selected, edit the Character and set the Token as that Character. 6) Add abilities to the Character that you want your monster to have.  Mark them as Token Actions.  Now, you can drag that Character onto the map as many times as you like and get individual copies of that monster.  Selecting them will list their abilities across the top as buttons (Token Actions).  They will each have their own hit point bar.  This is effectively the process of setting up " Mooks ", which you can review here:   <a href="https://wiki.roll20.net/Linking_Tokens_to_Journals" rel="nofollow">https://wiki.roll20.net/Linking_Tokens_to_Journals</a>