Power Platform Community Forum Thread Details

Could you please share a bit more about your scenario?

Do you want to create a cascading Dropdown boxes between four Dropdown boxes?

Further, do you want to populate other 3 Dropdown boxes against any Dropdown box selection?

Based on the needs that you mentioned, I afraid that there is no direct way to achieve your needs. If you configure the cascading Dropdown boxes based on any Dropdown box selection directly, I afraid that you would face circular reference issue within your Dropdown boxes.

The user @CRM-Kfar-Sava has faced similar issue with you, please check my response within the following thread:

https://powerusers.microsoft.com/t5/Building-Power-Apps/CRM-lookup-Circular-reference-between-properties-problem/td-p/195180

Add four ComboBox control within your app, then configure these ComboBoxes as below:

For ComboBox1:

Set the OnChange property to following:

Set(SelectedColumn2, If(!IsBlank(ComboBox2.Selected.Value), ComboBox2.Selected.Value, Blank()));
Set(SelectedColumn3, If(!IsBlank(ComboBox3.Selected.Value), ComboBox3.Selected.Value, Blank()));
Set(SelectedColumn4, If(!IsBlank(ComboBox4.Selected.Value), ComboBox4.Selected.Value, Blank()));
Set(SelectedColumn1, ComboBox1.Selected.Value);

Set the Items property to following:

Filter(
 'Data Source',
 If(
 !IsBlank(SelectedColumn2),
 Column2 = SelectedColumn2,
 true
 ),
 If(
 !IsBlank(SelectedColumn3),
 Column3 = SelectedColumn3,
 true
 ),
 If(
 !IsBlank(SelectedColumn4),
 Column4 = SelectedColumn4,
 true
 )
)

For ComboBox2:

Set the OnChange property to following:

Set(SelectedColumn1, If(!IsBlank(ComboBox1.Selected.Value), ComboBox1.Selected.Value, Blank()));
Set(SelectedColumn3, If(!IsBlank(ComboBox3.Selected.Value), ComboBox3.Selected.Value, Blank()));
Set(SelectedColumn4, If(!IsBlank(ComboBox4.Selected.Value), ComboBox4.Selected.Value, Blank()));
Set(SelectedColumn2, ComboBox2.Selected.Value);

Set the Items property to following:

Filter(
 'Data Source',
 If(
 !IsBlank(SelectedColumn1),
 Column1 = SelectedColumn1,
 true
 ),
 If(
 !IsBlank(SelectedColumn3),
 Column3 = SelectedColumn3,
 true
 ),
 If(
 !IsBlank(SelectedColumn4),
 Column4 = SelectedColumn4,
 true
 )
)

For ComboBox3:

Set the OnChange property to following:

Set(SelectedColumn1, If(!IsBlank(ComboBox1.Selected.Value), ComboBox1.Selected.Value, Blank()));
Set(SelectedColumn2, If(!IsBlank(ComboBox2.Selected.Value), ComboBox2.Selected.Value, Blank()));
Set(SelectedColumn4, If(!IsBlank(ComboBox4.Selected.Value), ComboBox4.Selected.Value, Blank()));
Set(SelectedColumn3, ComboBox3.Selected.Value);

Set the Items property to following:

Filter(
 'Data Source',
 If(
 !IsBlank(SelectedColumn1),
 Column1 = SelectedColumn1,
 true
 ),
 If(
 !IsBlank(SelectedColumn2),
 Column2 = SelectedColumn2,
 true
 ),
 If(
 !IsBlank(SelectedColumn4),
 Column4 = SelectedColumn4,
 true
 )
)

For ComboBox4:

Set the OnChange property to following:

Set(SelectedColumn1, If(!IsBlank(ComboBox1.Selected.Value), ComboBox1.Selected.Value, Blank()));
Set(SelectedColumn2, If(!IsBlank(ComboBox2.Selected.Value), ComboBox2.Selected.Value, Blank()));
Set(SelectedColumn3, If(!IsBlank(ComboBox3.Selected.Value), ComboBox3.Selected.Value, Blank()));
Set(SelectedColumn4, ComboBox4.Selected.Value);

Set the Items property to following:

Filter(
 'Data Source',
 If(
 !IsBlank(SelectedColumn1),
 Column1 = SelectedColumn1,
 true
 ),
 If(
 !IsBlank(SelectedColumn2),
 Column2 = SelectedColumn2,
 true
 ),
 If(
 !IsBlank(SelectedColumn4),
 Column4 = SelectedColumn4,
 true
 )
)

Please take a try with above solution, then check if the issue is solved.

Best regards,