How to give SetFilter/SetRange on Line No.

Hi Expert,

I want to give Setfilter or setrange at sales line table. My setfilter/setrange is base on "Line No.".

// Sales Line
// User Selected Line
// Return Selected Line No.
CurrForm.SETSELECTIONFILTER(l_recSalesLine);
LineCount := l_recSalesLine.COUNT;
IF LineCount > 0 THEN BEGIN
  l_recSalesLine.FIND('-');
  WHILE LineCount > 0 DO BEGIN
    LineCount := LineCount - 1;
    l_recSalesLine.MARKEDONLY(FALSE);
    l_intFirstLine := l_recSalesLine."Line No.";
    l_intLastLine := l_intFirstLine;
    l_blnMore := (LineCount > 0);
    WHILE l_blnMore DO
      IF l_recSalesLine.NEXT = 0 THEN
        l_blnMore := FALSE
      ELSE
        IF NOT l_recSalesLine.MARK THEN
          l_blnMore := FALSE
        ELSE BEGIN
          l_intLastLine := l_recSalesLine."Line No.";
          LineCount := LineCount - 1;
          IF LineCount = 0 THEN
            l_blnMore := FALSE;
        END;
    IF l_codSelectionFilter <> '' THEN
      l_codSelectionFilter := l_codSelectionFilter + '|';
    IF l_intFirstLine = l_intLastLine THEN
      l_codSelectionFilter := l_codSelectionFilter + STRSUBSTNO(l_Text0001,l_intFirstLine)
    ELSE
      l_codSelectionFilter := l_codSelectionFilter +  STRSUBSTNO(l_Text0001,l_intFirstLine)
                              + '..' +  STRSUBSTNO(l_Text0001,l_intLastLine);
    IF LineCount > 0 THEN BEGIN
      l_recSalesLine.MARKEDONLY(TRUE);
      l_recSalesLine.NEXT;
    END;
  END;
END;
EXIT(l_codSelectionFilter);
//
CurrForm.SETSELECTIONFILTER(p_recSalesLine);

// Button OnPuch
g_codFilter := CurrForm.SalesLines.FORM.GetSelectionFilter;
g_recSalesLine.SETRANGE("Document No.",g_codSOrderNo);
g_recSalesLine.SETRANGE("Line No.",g_codFilter); ---> This portion can't use, Line No. Integer

My Setfilter/setrange is base on user selected. But line no is integer return is code.
I give return value is code because of sometime line no are '10000...30000' or '10000|40000'.

How can i give filter by user selected line no? Please give me sugge:

Thanks And Regards,
Yukon