SAP - SRM - MDM - OCI mapping transport

Hi Experts,

we are working on SAP SRM with MDM for catalogs.

We have to change OCI mappings (to map a new MDM field to be transfered to shopping cart).

I found where these changes have to be done to change OCI mappings.

I have only 2 questions here, if someone has experienced these.

1) We see that there are 5 "customer fields" in OCI.

It is possible to add more customers fields ? (for exemple 5 more) Or it is limited to 5 fields maximum ?

2) How the changes have to be transported ?

I see there is a button to transport configuration. and when clicing on button I see "export" and "import" options.

Are the transports done by doing export/import of the xmls ?

Thanks .

Any kind of help is welcome Image may be NSFW.
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S.N