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It is likely best to establish a new LLC since you have a business partner in the DBA under your current LLC.
The main reason is that you're going to have potential liabilities and revenue streams that should not be commingled under one entity's name - especially since you have a partner in a DBA. This could create issues of who is entitled to what - - and it's usually best just to try and avoid the mess altogether.
Also, limited liability protection of the LLC will only extend to the operations that it can clearly be associated with. So, if this new venture is doing things outside of the scope of the original LLC's business, that could be an issue as well.