Login to SSIS on server with plans to export
Navigate to Stored Packages – MSDB – Maintenance Plans
Right click on the maintenance plan you want to export – choose Export Package
Choose package location (I usually use File System for easy transfer to another server)
Login to SSIS on server you want to import plans on to
Navigate to Stored Packages – MSDB
Right click on Maintenance Plans – choose Import Package
Navigate to where exported package lives