Add a record to an extra table which belongsto the actual table.

I have a form to input all the items of a coin.
There is - besides others - also an attribute "Nominal" to enter.
Nominals are kept in an extra table which is joined to coins with a
"belongsto".
The existing items can be selected in a drop-down - everything's fine!
But what, if there es a new nominal which has to be inserted into
nominals and into coins.
I would like to have a textfield to enter the nominal - and a function
which
inserts the new nominal into the table nominals and the reference to
it into
the table coins. Alternatively I would like to have a button to open
the add form for nominals to insert the new item and coming back to
the unchanged coin form where I left it - hopefully the reference of
the new nominal inserted.

Can anyone give me a leed to an example or a tutorial for a newbie?
I think I have to delve into Ajax - right?
Thanks a lot.

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