How to create a parameter library to use in different workbooks with PQ

I took it a step further and give you an example.

I created this little table in Excel

I created the following query in aanother workbook

let
    // Connect to the parameter workbook. 
    Source = Excel.Workbook(File.Contents("C:\.....\How to create a parameter library to use in different workbooks with PQ.xlsx"), null, true),
    // Access the ParameterTable
    ParameterTable_Table = Source{[Item="ParameterTable",Kind="Table"]}[Data],
    // Transpose it: Rows become columns and vice versa
    #"Transposed Table" = Table.Transpose(ParameterTable_Table),
    // First row is the name of the parameters: Turn it into column names
    #"Promoted Headers" = Table.PromoteHeaders(#"Transposed Table", [PromoteAllScalars=true]),
    // Turn the table in a list of records (with only 1 element)
    Custom1 = Table.ToRecords(#"Promoted Headers"),
    // Access the first (and//  only) element
    Custom2 = Custom1{0}
in
    // Return the record
    Custom2

Producing this:

And I refferred to the P1 parameter from another query like this:

Hope this clarifies and helps...