Photoshop question how to export PDB files for web
So sadly I'm working on editing an image which is 40,000x40,000 pixels, yes its a beast. So I need it split in to about 150 pieces. I have done this plenty of times before, by exporting it to web. But since its a PSB the option to export for web is disabled, anyway to enable that option, or alternatives to my crazy exporting process?