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as Ravi suggested, hierarchy levels are generally global in Jira, and any issue can always only have one parent in Portfolio/Advanced Roadmaps.
This being said, if you're open to solutions from the Atlassian Marketplace, there are options available: From the different hierarchy-focused apps available, some do support multiple hierarchy configurations, which can then be used on or across selected projects. These apps typically come with their own views (which are different from e.g. Portfolio/Advanced Roadmaps), but depending on the exact problem you are trying to solve, these views may work just as well.
As an example, my team and I work on an app named JXL for Jira, in which multiple hierarchies are trivial to model. Pay attention to epic WORK-142:
Depending on your configuration, it's either a child of OKR-1, or a child of initiative WORK-161. (Our epic is connected to both of them via issue links.)
For some more context, JXL is a full-fledged spreadsheet/table view that allows viewing, inline-editing, sorting, and filtering by all your issue fields, much like you’d do in e.g. Excel or Google Sheets. It also comes with a range of advanced features, including the support for configurable issue hierarchies, sum-ups, or conditional formatting.
As mentioned above, there may be other apps that can help with that, too. You may already know that you can trial any app for free for 1 month, and depending on the size of your size, it may be free forever. So if an app is an option for your, perhaps try a few and see which works best for you.