Hi Terje,
If you go to requirement CAMO.A.300, you can see that CAME must address subjects of SMS. However, AMC1 CAMO.A.300 has the following statement:
"The information required by CAMO.A.300 should be provided, directly or by reference, in the CAME."
Your Management System Manual (MSM) is perfectly ok as long you maintain structure demanded for the CAME and reference the specific points of MSM that answers each specific/applicable point of CAME. You don't need to write everything in detail. Same goes for OM-A.
The concept of Management System is precisely to uniform and streamline processes across the organization and stop working in silos.
Until now, the only thing I saw replicated throughout manuals was the company Safety Policy.

Hi Terje,
To complete what Ana wrote, you are allowed to have a separate SMS manual. In switzerland, operators use the OMM, Organisation's Management Manual (OMM). The Organisation’s Management Manual documents the management system including all superior aspects of the company such as, policies, common processes, guidelines and responsibilities, reporting, etc. that are common across the whole company. You can find good guidance material in the following website:
https://www.bazl.admin.ch/bazl/fr/home/flugbetrieb/allgemeine-themen/gm…
Look in that page for the document "FOCA GM/INFO - CL Management System (PDF, 2 MB, 01.11.2023)", in chapter 3.3.2 of that document, FOCA describes the OMM structure (chapter and subchapters). All other manuals should then refer to the OMM (for reporting processes, responsibilities, Record keeping, etc.).
The OMM is accepted by several other authorities in Europe, such as TM-CAD.
Be careful though, the OMM must be approved by the authorities. If you are an NCC operator, your OMM is not approved, therefore the authorities may refuse to approve a CAME or MOE referring to this document.
I hope it helps.

Thanks both of you, it was very helpful. Especially the link to FOCA docs