Declension table of ?upayāna

Neuter	Singular	Dual	Plural
Nominative	upayānam	upayāne	upayānāni
Vocative	upayāna	upayāne	upayānāni
Accusative	upayānam	upayāne	upayānāni
Instrumental	upayānena	upayānābhyām	upayānaiḥ
Dative	upayānāya	upayānābhyām	upayānebhyaḥ
Ablative	upayānāt	upayānābhyām	upayānebhyaḥ
Genitive	upayānasya	upayānayoḥ	upayānānām
Locative	upayāne	upayānayoḥ	upayāneṣu

Compound upayāna -

Adverb -upayānam -upayānāt