Declension table of ?upāyatva

Neuter	Singular	Dual	Plural
Nominative	upāyatvam	upāyatve	upāyatvāni
Vocative	upāyatva	upāyatve	upāyatvāni
Accusative	upāyatvam	upāyatve	upāyatvāni
Instrumental	upāyatvena	upāyatvābhyām	upāyatvaiḥ
Dative	upāyatvāya	upāyatvābhyām	upāyatvebhyaḥ
Ablative	upāyatvāt	upāyatvābhyām	upāyatvebhyaḥ
Genitive	upāyatvasya	upāyatvayoḥ	upāyatvānām
Locative	upāyatve	upāyatvayoḥ	upāyatveṣu

Compound upāyatva -

Adverb -upāyatvam -upāyatvāt