Welcome to SolidWorks forums Chris.
You need to create series of sketch entities to get the center line (preferably using one 3d sketch) and then measure the values. If you can attach the file here or some sample file, one may show you how to do that.
Please use "advanced editor" in case you want to attach any files.
You might also find this post helpful for your future reference.
There seems to be something wrong with that discussion that you put together for new users. Your first post seems to have been replaced with one from another discussion, at least for me. This is what I get when I click on the link:
As you can see, the first post even has a different discussion title than the replies.
Thanks for bringing it up Glenn, I'm seeing the same issue here
Can someone from SolidWorks fix that. Thanks