Power Query -- Group-by-Result Expand - powerbi

Question

Here's an example of my existing data set. I have unique parts (Part) grouped by what factory # (Factory) they're used in and when the parts started to be used in operation (Part Install Year).
Part
Factory
Part Install Year
1
100
2018
2
100
2018
3
100
2018
3
200
2019
3
300
2020
4
400
2019
5
400
2020
6
500
2018
Desired Output is below. I need to group all the related parts by the lowest numbered factory they are installed in (Part Grouping) and then calculate the earliest year any part was installed in that factory (Factory Install Year). I'm having trouble figuring out how to create the Factory Install Year. Thank you!
Part
Factory
Part Install Year
Part Grouping
Factory Install Year
1
100
2018
100
min of all Dates in Factory 100
2
100
2018
100
min of all Dates in Factory 100
3
100
2018
100
min of all Dates in Factory 100
3
200
2019
100
min of all Dates in Factory 100
3
300
2020
100
min of all Dates in Factory 100
4
400
2019
400
min of all Dates in Factory 400
5
400
2020
400
min of all Dates in Factory 400
6
500
2018
500
2018

Answer 1

Try
let Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Part Install Year", type number}, {"Factory", type number}}),
EarliestYear = Table.Group(#"Changed Type", {"Factory"}, {{"EarliestYear", each List.Min([Part Install Year]), type nullable number}}),
#"Grouped Rows" = Table.Group( #"Changed Type", {"Part"}, {
{"data", each _, type table },
{"MinFactory", each List.Min([Factory])},
{"EarliestYear", each try EarliestYear[EarliestYear]{List.PositionOf(EarliestYear[Factory],List.Min([Factory]))} otherwise null}
}),
#"Expanded data" = Table.ExpandTableColumn(#"Grouped Rows", "data", {"Factory", "Part Install Year"}, {"Factory", "Part Install Year"})
in #"Expanded data"