Linked Cases Related list Add Button for Agent Workspace for HR Case Management

[saic2]

I need a Related List with name as Linked Case with the configuration need to link the 2 different Employee Relation cases into one. For this I have created a many to many Definition with the below Information 

i have created a Relationship as well with below code 

(function refineQuery(current, parent) {

    var cu = current.sys_id;

    var par = parent.sys_id;

    current.addEncodedQuery("u_sn_hr_er_case_from.sys_id="+par +"^ORu_sn_hr_er_case_to.sys_id="+par+"^ORu_sn_hr_er_case_fromSTARTSWITHhrc" );  

})(current, parent);

can someone help me with the next procedure and if the above code is correct or not i am unable to figure it out.

[jcmings]

Are you able to use parent/child relationships or the existing Related Cases related list?