ahhh so annoying - so you've created a parent content type and you've associated it with multiple child content types and you want to associate it to a workflow for them, they are really similar BUT not with every damned content type in the box - can you do it? NOPE. SO ANNOYING, the solution is that you'll have to create workflows for each of your content types. Before you say it - yes I know you can probably solve this in Visual studio but are you familiar with change management in big companies - lots of not fun and puts the mockers on doing any development. So that's off the agenda. I know someone who built a WHOLE CMDB application in SPD on a development box just to avoid any change management oooh the irony, the upshot is it featurized, of course not , is it supportable , you'd hope....
I digress, so the only solution is to use the ability of globally reusable workflows to be copied and modified, to speed the process up BUT I am not relishing the request that will inevitably come for changes to the workflow.
