Hi, Link to File: Excel File I am trying to create a combined table from 2 source tables (Base_AnalysisTimeline and Benefits_Calc). I want to take the list of dates from the Base_AnalysisTimeline and have them repeat for every unique Benefit GUID from Benefits_Calc. I've got this part working. What I am struggling with is now inserting the Benefit GUID at each point where the row repeat begins, ie: Benefit GUIDCountCompound...Discount Factor...U1B10 1 2 3 ETC U1B20 1 2 3 ETC U1B30 1 ETC I had created the testFunction1 to generate the list of distinct GUIDs and then to loop through and update the value it pulls from the list based on the index. This would then provide the next GUID in the list when the Count = 0. There is something going wrong, and in the table when I invoke the function I get:"Expression.Error: We cannot convert the value 4 to type Function.Details:Value=4Type=[Type]" This is my first time doing any M coding and working with power query, so any possible help would be greatly appreciated. Thanks in advance!

Hello Andyb431 try this approach. Use your BenefitGUID-table and add a new column where you inserting you Timeline-table on every row. After that you expand the table let Base_AnalysisTimeline= let Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlSK1YlWMgKTxmDSBEyagkkzMGkOJi2UYmMB", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Count = _t]), #"Changed Type" = Table.TransformColumnTypes(Source,{{"Count", Int64.Type}}) in #"Changed Type", BenefitGUID = #table({"Benefit GUID"}, {{"U1B1"}, {"U1B2"}, {"U1B3"}}), Multiply = Table.AddColumn ( BenefitGUID, "BaseAnalysisTimeLine", each Base_AnalysisTimeline ), Expand = Table.ExpandTableColumn(Multiply, "BaseAnalysisTimeLine", {"Count"}, {"Count"}) in Expand Copy paste this code to the advanced editor in a new blank query to see how the solution works.If this post helps or solves your problem, please mark it as solution (to help other users find useful content and to acknowledge the work of users that helped you)Kudoes are nice tooHave funJimmy

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