Customizing an Existing Enquiry Screen ( Project Transaction Details)

Hello 

I am working on customization screen ( Project Transaction Details) 

I want to add new selector field to the exisintg Enquiry screen. The problem I am facing is 

1)  The  exsiting acumatica DAC Filter values, they are hidden  and in same graph(TransactionInquiry)
2) When I try to extend this filter and add new filter (i.e a new selector), it is not showing in my customization screen.
3) I feel, as existing fields are all unbound and its hidden, my newly added  extended dac filter selector is not exposed and does not recognize the TranFilter DAC. 

        [PXHidden]
        [Serializable]
        [System.Diagnostics.CodeAnalysis.ExcludeFromCodeCoverage]
        public class TranFilter : IBqlTable
        {
            #region ProjectID
            public abstract class projectID : PX.Data.BQL.BqlInt.Field<projectID> { }
            protected Int32? _ProjectID;
            [Project(typeof(Where<PMProject.baseType, Equal<CT.CTPRType.project>,              And<PMProject.nonProject, Equal<False>>>), WarnIfCompleted = false)]

            #endregion

            #region AccountGroupID
    ……………………..
            #endregion
            #region ProjectTaskID
    ……………………..
            #endregion
            #region CostCode
    ……………………..
            #endregion

   ……………………...
       }

Could anyone please help me and suggest the best practice ,
1) Add new field value( a selector dac) via extending this TranFilter DAC, and I want my new selector to behave just like projectID field.
2) have it in use via extenidng the  graph via delegate