Parse SubAccount to get individual segments

I believe some of the logic used to separate the segment are in the protected Definition class. The separated segments are in the Dimensions collections of the Definition class. You can access it in attributes that derive from PXDimensionAttribute class but since Definition class is protected you can't access it in a graph because PXGraph/PXGraphExtension don't derive from it.

Not much can be extracted from Dimension because most properties are protected: You can roll your own by reading the segments of the segmented key:

Here is an example that write the segment values of the transactions subaccount in the trace for the Invoices and Memos screen:

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

namespace PX.Objects.SO
{
  public class ARInvoiceEntry_Extension : PXGraphExtension<ARInvoiceEntry>
  {
      public void ARTran_RowSelected(PXCache cache, PXRowSelectedEventArgs e)
      {
          ARTran tran = e.Row as ARTran;

          if (tran != null && tran.SubID.HasValue)
          {
                Sub sub = SubAccountAttribute.GetSubaccount(Base, tran.SubID.Value);

                if (sub != null && sub.SubCD != null)
                {
                    short segmentStartIndex = 0;

                    foreach (Segment segment in PXSelect<Segment,
                                                Where<Segment.dimensionID, Equal<Required<Segment.dimensionID>>>,
                                                OrderBy<Asc<Segment.segmentID>>>.Select(Base, "SUBACCOUNT"))
                    {
                        if (segment.SegmentID.HasValue && segment.Length.HasValue)
                        {
                            PXTrace.WriteInformation(string.Format("Segment {0}: {1}",
                                                                   segment.SegmentID,
                                                                   sub.SubCD.Substring(segmentStartIndex, segment.Length.Value)));

                            segmentStartIndex += segment.Length.Value;
                        }
                    }
                }
          }
      }
  }
}

Trace results: