Depends on what you mean by "integrate".
An issue type in a project can only have one workflow. So, if by "integrate" you mean you want to use two different workflows, you can't - you need to have two different issue types. If you mean you want to merge them though, then you need to come up with a new workflow that implements all the routes you might take through the process and consider blocking/allowing transitiosn with conditions.
Oh, I see, standard usage.
Assuming you've got "bug workflow" and "story workflow" already set up, then create a "workflow scheme", and set it up to say "for bugs use bug-workflow" and "for stories use story-workflow". Then associate it with the project.
See https://confluence.atlassian.com/display/JIRA/Configuring+Workflowand look at the pages under it as well.
That's not a workflow change.
This error is you trying to change the issue type scheme. It means what it says - you're trying to change from a scheme that has sub-tasks to one that does not. You can't do that unless you convert all the sub-tasks to top level issues. Either do that, or add at least one sub-task type into the new scheme.
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