If Filed exist in MS Access then Drop it:

Function ifFieldExists(ByVal fieldName As String, ByVal TableName As String) As Boolean
Dim db As DAO.Database
    Dim tbl As TableDef
    Dim fld As Field
    Dim strName As String
    Set db = CurrentDb
    Set tbl = db.TableDefs(TableName)
    For Each fld In tbl.Fields
        If fld.Name = fieldName Then
            ifFieldExists = True
            Exit For
        End If
    Next
End Function
Execution Process:
If ifFieldExists("INDC", "Import_process") Then
Else
db.Execute "Alter table Import_process add column INDC text"
End If