You will have to use VBA to accomplish this.
See if the attached is what you intended.
Data validation was removed from C11 and an active-x combobox used in its place.
Option Explicit
Private Sub ComboBox1_Change()
With Me
Range("C11") = .ComboBox1.Value
.ComboBox1.Visible = False
End With
End Sub
Private Sub Worksheet_SelectionChange(ByVal Target As Range)
If Not Intersect(Target, Range("C11")) Is Nothing Then
Select Case Range("B11").Value
Case Is = "CASH"
Range("C11").Value = "Yes"
Range("c11").Interior.ColorIndex = 5
Case Else
Range("C11").Interior.ColorIndex = xlNone
Me.ComboBox1.Visible = True
End Select
End If
End Sub
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