What to do? Volumes Similar names

HI. I wanted to ask what to do when you are trying to add a new volume, but there is already a series with the same name.

All 3 volumes of Runaways are just called Runaways.

Similar to what Pix said, there are at least 4 volumes called New Warriors and New Mutants.  In many occasions the name is the same, but the details are different.   As long as it genuinely IS a different volume and you have the publisher details (etc) correct, then it should be okay.
 
You're not quite at the Live Edit stage yet, right? In that case, submit it with as much detail as you can and see if the moderators agree... if they do, then you have a new volume!  If not... then no new volume, but it wont be the end of the world :) 

Searching for volumes used to be better, it'd be nice if the year or at least the thumbnails were larger to easily see in search which one is which. 
If the volume hasn't been created yet, create it using the link on the help page. If its called Legacy, just call it Legacy.

I'm not sure why Cliffhanger has two volumes for Crimson.  Or why the first Danger Girl & Battle Chasers aren't listed among their volumes.