Full import/export is more properly designated for the backup/restore type of operation. There is no way to exclude pieces, either on export or import, although this is possible with a script that iterates over all projects (or at least all that are not part of CloudBees CD (CloudBees Flow) and/or plugins) and export each one of them. Then you can import them into the other system.
The procedure for exporting individual projects is attached.
Notes regarding the procedure:
This procedure should work for Commander 5.x and CloudBees CD (CloudBees Flow) 6.x and above.
By default, this procedure imports itself into a project called "EA Testing".
You need to either create this project (if it does not exist) or provide an import path such as
ectool import export_procedure_Export\ All\ Projects.xml --path /projects/<projectName >/procedure/<procedureName >
(again, <projectName> is the name of an existing project).
This procedure has three steps:
create a list of all projects and store it in a property
export the procedure itself (for convenience)
export projects into the job’s workspace
Review the code to see if you need to adjust anything (for example, project filters in the first step).