trying to save sub, sub pages please help!

Hi there, I hope someone can help with this please

I've created a sub page on my site, and now I'm trying to create sub pages off that page eg

Sub Page - www.blue.com/red-things.html

Sub Sub Page - www.blue.com/red-things/blue-things.html

When I save the file red-things/blue-things.html on DW is says that the file name is not valid.

Could somebody please tell me where I am going wrong.

Thanks,

Terry

 

create a folder "red-things" and save blue-things.html file in that folder.

 

Thanks very much