Changing default title of relationships box

Hi,

Yes, it is possible. You can add the setting meta box title to the from or to array. For example:

'from'  => [
    'object_type'   => 'post',
    'post_type'     => 'post',
    'meta_box'      => [
        'title' => 'Custom connected'
    ]
],
'to'    => 'page',

Read more on the documentation https://docs.metabox.io/extensions/mb-relationships/#syntax

If you use the builder, you can click on the tab Meta Box, screenshot https://share.getcloudapp.com/P8u5qJYl.

Hi,

You can create many relationships between objects as you want: post types, users, terms.
For post object, specific by post_type setting.
For term object, specific by taxonomy setting.

add_action( 'mb_relationships_init', function() {
    MB_Relationships_API::register( [
        'id'    => 'events_to_venues',
        'from'  => [
            'object_type'   => 'post',
            'post_type'     => 'event',
            'meta_box'      => [
                'title' => 'Link to Venues'
            ]
        ],
        'to'    => [
            'object_type'   => 'post',
            'post_type'     => 'venue',
            'meta_box'      => [
                'title' => 'Assigned Events'
            ]
        ],
    ] );
} );

add_action( 'mb_relationships_init', function() {
    MB_Relationships_API::register( [
        'id'    => 'venues_to_workzone',
        'from'  => [
            'object_type'   => 'post',
            'post_type'     => 'venue',
            'meta_box'      => [
                'title' => 'Link to Work Zones'
            ]
        ],
        'to'    => [
            'object_type'   => 'post',
            'post_type'     => 'workzone',
            'meta_box'      => [
                'title' => 'Link to Venues'
            ]
        ],
    ] );
} );

add_action( 'mb_relationships_init', function () {
    MB_Relationships_API::register( [
        'id'   => 'categories_to_workzone',
        'from' => [
            'object_type' => 'term',
            'taxonomy'    => 'category',
            'meta_box'      => [
                'title' => 'Assigned Work Zones'
            ]
        ],
        'to'    => [
            'object_type'   => 'post',
            'post_type'     => 'workzone',
            'meta_box'      => [
                'title' => 'Link to Categories'
            ]
        ],
    ] );
} );

Please read more on the documentation
https://docs.metabox.io/extensions/mb-relationships/#terms-to-posts
https://docs.metabox.io/extensions/mb-relationships/#users-to-posts