Dependant Dropdown Using Dynamic Arrays

[KanwalNo1]

Hi Excel Gurus,

I am trying to create a Dependent Dropdown List using Dynamic Arrays. When we select a client name in Column R, then column S should contain list of only related holder names. I have used dynamic array formula in each cell of range G2:G6. I tried to use SEQUENCE to achieve the same result using formula in a single cell, but the formula used in Cell G10 is returning error message.

Though I was able to create dependent dropdown list in Column S, but request yours help on the following points.

1. Kindly help to identify the issue in formula in Cell G10

2. Why can't I use dynamic array formula in Validation box directly ? I am not able to use FILTER in Validation box to create a list.

3. Can LAMBDA help to achieve the result using a single formula for Column F and G, whereby it creates a unique list of Clients in Column F and Dependent holders list in Column G ?

4. Has someone came up with something unique to tackle such situation ?

5. Can Power Query be helpful here ?

Regards

Kanwaljit

[#2 · Accepted solution]

@KanwalNo1 

What you try to generate in G10 that's array of array which is not supported by Excel, at least directly. There are different, but similar, techniques for workarounds. As variant, in your case it could be

=LET(
    clients, UNIQUE(Table1[Client Name]),
    totalClients, ROWS(clients),
    holderName, LAMBDA(clientName,holders,clients,
        TRANSPOSE(FILTER(holders, clients=clientName)) ),
    fakeArray, LAMBDA(array, LAMBDA(array)),
    arrayOfFakeArrays, MAP( clients,
        LAMBDA(client,
        fakeArray( holderName( client, Table1[Holder Name], Table1[Client Name])))),
    result, MAKEARRAY( totalClients,9,
        LAMBDA(row,col,
            LET(getRow, INDEX(arrayOfFakeArrays,row,1)(),
                INDEX(getRow,1,col)))),
    IFERROR( result, "")
)

You can't use arrays in data validation list, only ranges. More exactly references on them.

[#3]

Dear Sergei,
Most of the things you do, seems like magic to me :)
Do allow me sometime to grasp the solution. You got my respect !
Thanks a Lot !

Can LAMBDA be used to produce the result in all the columns Including Unique Client List in First Column ?

Regards
Kanwaljit

[#4]

@KanwalNo1 

Yes, you may add it as first column making resulting array:

=LET(
    clients,       UNIQUE(Table1[Client Name]),
    totalClients,  ROWS(clients),
    holderName,    LAMBDA(clientName,holders,clients,
        TRANSPOSE(FILTER(holders, clients=clientName)) ),
    fakeArray,     LAMBDA(array, LAMBDA(array)),
    arrayOfFakeArrays, MAP( clients,
        LAMBDA(client,
        fakeArray( holderName( client, Table1[Holder Name], Table1[Client Name])))),
    result,        MAKEARRAY( totalClients, 10,
        LAMBDA(row,col,
            LET(getRow, INDEX(arrayOfFakeArrays,row,1)(),
                IF( col=1, INDEX( clients, 1), INDEX( getRow, 1, col-1 ) ) ) ) ),
    IFERROR( result, "")
)

[#5]

@Sergei Baklan 

The latest formula is working, but the First column contains only "India 01" in all the rows instead of Unique Client Names.

[#6]

@KanwalNo1 

Sorry for the misprint. Corrected in attached file.

[#7]

Thanks a Lot Sergei !
That is great learning source !
You have created a lot of named ranges ! Where do you do that ?
Directly in the "refers to" box or what ?
I am not able to see a thing in the "refers to" box as it not re-sizeable. Am I doing something wrong ?

[#8]

@KanwalNo1 

In your case everything is within LET(). You may remove added names, they are from intermediante calculations using Advanced formula environment - Microsoft Garage