(サンプルA)
Dim myrange As Range
Dim sagasu As String
sagasu = ooxx
Set myrange = Worksheets("未処理").Range("AE:AE").Find(what:=sagasu)
(サンプルB)
Dim list_name As String
Dim myrange As Range
list_name = ListBox1.List(intIndex)
Set myrange = Worksheets("登録").Range("b:b").Find(what:=list_name)