How to reference an index from another table in a function

let
    expand = (tbl) => Table.SplitColumn(Table.TransformColumns(Table.FromList(tbl, Splitter.SplitByNothing(), null, null, ExtraValues.Error), {"Column1", each Text.Combine(List.ReplaceValue(_,null,"",Replacer.ReplaceValue), "|"), type text}), "Column1", Splitter.SplitTextByDelimiter("|", QuoteStyle.Csv),{"LocationFacilty","LocationStatus","LocationCity","LocationState","LocationZip","LocationCountry","LocationContactName","LocationContactEmail","LocationContactPhone"}),
    Source = Excel.Workbook(File.Contents("C:\Users\xxx\Downloads\10examples.xlsx"), null, true),
    Sheet1_Sheet = Source{[Item="Sheet1",Kind="Sheet"]}[Data],
    #"Added Custom" = Table.AddColumn(Sheet1_Sheet, "URL data", each Json.Document( Web.Contents("https://classic.clinicaltrials.gov/api/query/study_fields?expr=AREA[NCTId]" & [Column1] & " &fields=NCTId,BriefTitle,LocationFacility,LocationStatus,LocationCity,LocationState,LocationZip,LocationCountry,LocationContactName,LocationContactEmail,LocationContactPhone&fmt=json"))[StudyFieldsResponse][StudyFields]{0}),
    #"Expanded URL data" = Table.ExpandRecordColumn(#"Added Custom", "URL data", {"Rank", "NCTId", "BriefTitle", "LocationFacility", "LocationStatus", "LocationCity", "LocationState", "LocationZip", "LocationCountry", "LocationContactName", "LocationContactEMail", "LocationContactPhone"}),
    #"Added Custom1" = Table.AddColumn(#"Expanded URL data", "Custom", each try expand(List.Zip({[LocationFacility],[LocationStatus],[LocationCity],[LocationState],[LocationZip],[LocationCountry],[LocationContactName],[LocationContactEMail],[LocationContactPhone]})) otherwise #table({"LocationFacilty", "LocationStatus", "LocationCity", "LocationState", "LocationZip", "LocationCountry", "LocationContactName", "LocationContactEmail", "LocationContactPhone"},{{"", "", "", "", "", "", "", "", ""}})),
    #"Replaced Value" = Table.ReplaceValue(#"Added Custom1",each [BriefTitle],each List.First([BriefTitle]),Replacer.ReplaceValue,{"BriefTitle"}),
    #"Removed Other Columns" = Table.SelectColumns(#"Replaced Value",{"Column1", "BriefTitle", "Custom"}),
    #"Expanded Custom" = Table.ExpandTableColumn(#"Removed Other Columns", "Custom", {"LocationFacilty", "LocationStatus", "LocationCity", "LocationState", "LocationZip", "LocationCountry", "LocationContactName", "LocationContactEmail", "LocationContactPhone"})
in
    #"Expanded Custom"

This works for the test IDs.  

Note 1: because of the empty lists I had to remove nulls with empty strings

Note 2: The second to last ID has no extra data at all, so I had to introduce a dummy stand-in table