to create an import specification
1. File>get external data>import
2. select in the File of types box Text files (*.txt etc..
3. select the file
4. in the import text wizard window select delimited
5. Click advanced
6. in the import specification window
type the name of the field in the Field Name column
(here you can use the field names of the destination table, specify data type,
check the box Skip if you do not want to import the column)
7 click save as, give the specification a name <-- this is the specification name that you will use in the command line below