As per observation of grammar Rule for the matra of Aukad under last letter is as
1.....When two words are together where first is with Aukad and the next is also with Aukad Both words are treated as NOUN
as AMRITu NAAMu
2....When first word is without matra of Aukad and the next With matra of Aukad .In this case first word is an ADJECTIVE
and next word is NOUN.
as AMRIT NAAMu
There is an exception to the above Rules where first word is without Aukad and next word is With matra of Aukad then
the first word is takan as word with Aukad matra and treated as NOUN.
The word without matra of Aukad is also considered as with matra of Aukad as NOUN if this word has some connecting
preposition like Ka,Kee.Ke.,Te and any other like this.
Any other information on this Rule may be helpful to me also.
Bhul Chuk Maaf
Daas
Prakash.S.Bagga