I’m positive that GW to CS is not possible, since Governance is enforced from CS to GW.
However, you can publish your services from Designer to CS (GW configuration such as Policies, for those services, i.e., APIs won’t be available).
Alternatively, a manual export from GW to CS should be possible (I’ll admit that I haven’t tested this).
Note - I haven’t worked with CS in a long time, so I welcome any corrections
KM
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