Calculated Column - Fill Using Text From Another Column

Hi tonybrogan 

You can try the following solutions.

1.Put the following code to advanced editor in power query

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMjQwUNJRcnRyBpIKSrE6qCJe+akKTjn56enFEClDDMVEiBiBDXRxdcMq4pFYVFSp4FSUX56HQ7UxWCQiMopSEUN8IsElqWWpCo6lxSWZeTiUGxqYookYoaqJBQA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [DocumentNo = _t, Reference = _t, Employee = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"DocumentNo", Int64.Type}}),
    #"Grouped Rows" = Table.Group(#"Changed Type", {"Reference"}, {{"Count", each List.Max([Employee]), type nullable text}, {"Data", each _, type table [DocumentNo=nullable number, Reference=nullable text, Employee=nullable text]}}),
    #"Expanded Data" = Table.ExpandTableColumn(#"Grouped Rows", "Data", {"DocumentNo", "Employee"}, {"DocumentNo", "Employee"}),
    #"Reordered Columns" = Table.ReorderColumns(#"Expanded Data",{"Reference", "DocumentNo", "Employee", "Count"})
in
    #"Reordered Columns"

Output

2.You can create a calculated column

Column =
MAXX (
    FILTER (
        'Table (2)',
        [Reference] = EARLIER ( 'Table (2)'[Reference] )
            && [Employee] <> BLANK ()
    ),
    [Employee]
)

Output

Best Regards!

Yolo Zhu

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