Multiple tax code in MIRO

Hi,

Two doubts:

1. In MIRO, in Basic tab, i get only few tax codes, whereas in Tax tab i get a bunch of tax codes, can i get all of those in tax field in basic tab itself

2. Is it possible to post one MIRO with 2 or more PO resulting in more than one tax code, i mean we should be able to post one FI doc, with one or more PO, and at same time, it should be possible to use multiple tax codes in different line items

Thanks

Balla