Customer screen Attribute to display in Customer Location screen.

@sujithra

@ddunn is absolutely correct. You will need to join the attribute with customers if you need the assigned Tech to customers as per Dunn's instructions. 

From the previous thread regarding “Sales Rep”, I guess you will need the list of all your technicians. Considering you are new to Acumatica I thought you might need a hand. Below is what you will need in your DAC Ext. Replace the “COLOR” with your Technician AttributeID whatever it is.

using PX.Data;
using PX.Objects.AR;
using PX.Objects.CR;
using PX.Objects.CS;

namespace PX.Objects.CR
{
	public class TechAttributeID : PX.Data.BQL.BqlString.Constant<TechAttributeID>
	{
		public TechAttributeID() : base("COLOR") { } 
	}

	public sealed class MyCRLocationExt : PXCacheExtension<PX.Objects.CR.Location>
    {
        public static bool IsActive() => true;

		#region UsrPreferredTech
		public abstract class usrPreferredTech : PX.Data.BQL.BqlString.Field<usrPreferredTech> { }
		[PXDBString(10, IsUnicode = true, InputMask = "")]
		[PXUIField(DisplayName = "Preferred Tech", Required = true, Enabled = true, Visible = true)]
		[PXDefault(PersistingCheck = PXPersistingCheck.Null)]
		[PXSelector(typeof(Search<CSAttributeDetail.valueID,
						Where<CSAttributeDetail.disabled, NotEqual<True>>,
						OrderBy<Asc<CSAttributeDetail.sortOrder>>>),
                    typeof(CSAttributeDetail.valueID),
                    typeof(CSAttributeDetail.description),
                    typeof(CSAttributeDetail.disabled),
					SubstituteKey = typeof(CSAttributeDetail.valueID),
					DescriptionField = typeof(CSAttributeDetail.description),
                    ValidateValue = true)]
        [PXRestrictor(typeof(Where<CSAttributeDetail.attributeID, Equal<TechAttributeID>>), "Invalid Technician")]
		public string UsrPreferredTech { get; set; }
		#endregion
	}
}

You will need to add the custom field (String 10) to your table as well 

<Table TableName="Location">
	<Column TableName="Location" ColumnName="UsrPreferredTech" ColumnType="string" AllowNull="True" MaxLength="10" DecimalPrecision="0" DecimalLength="0" IsNewColumn="True" IsUnicode="True" />
</Table>

Publish your customization, then add the control to your screen

<px:PXSelector runat="server" ID="edUsrPreferredTech" DataField="UsrPreferredTech" CommitChanges="True" />

and you should get the below UI