job_bm_dashboard_tabs

add_filter('job_bm_dashboard_tabs', 'job_bm_dashboard_tabs');
function job_bm_dashboard_tabs($tabs){

    $tabs['custom'] =array(
        'title'=>__('Custom', 'job-board-manager'),
    );

    return $tabs;
}

add_action( 'job_bm_dashboard_tabs_content_custom', 'job_bm_dashboard_tabs_content_custom_29072019', 5 );
if ( ! function_exists( 'job_bm_dashboard_tabs_content_custom_29072019' ) ) {
    function job_bm_dashboard_tabs_content_custom_29072019(){
        ?> <pre>Content custom tabs</pre>
        <?php
    }
}

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Remove existing tabs based on user roles.

add_filter('job_bm_dashboard_tabs', 'job_bm_dashboard_tabs');
function job_bm_dashboard_tabs($tabs){

    $current_user = wp_get_current_user();

    if(in_array('job_seeker', $current_user->roles)){
        unset($tabs['applications']);
        unset($tabs['my_jobs']);
    }
    
    return $tabs;
}