How to create a new virtuemart layout [SOLVED]

[_margie_]

hi
in virtuemart you can add a menu item for a Category Layout where you can see the categories and the products and a VirtueMart Categories Layout where you can see the categories
now I want to create a new Layout where all the products are in one column
I have tried to do it myself by looking how the category layout is implemented in the code, but can't figure out how to create a new layout, so that when I add a new menu item I can select my own layout

can anyone help me with this, it's very important

I use 2.0.18a VM and 2.5 Joomla!

thanks