I have a product category which contains a number of sub categories. I would like when you click on the parent category to redirect into one of the child categories. Additionally my client would like to change which category it redirects into periodically, so the configuration of this needs to be controlled through the Magento admin too.
Wondering if it would be possible to accomplish this through the 'Custom Layout Update' field?
You can do this with Catalog -> URL Rewrite Management
This really isn't a good idea; I'd personally use an Apache rewrite or something, but this way it's manageable from the Admin panel. Your client will only need to do step 8 after you do the setup.