Declension table of ?upasattva

Neuter	Singular	Dual	Plural
Nominative	upasattvam	upasattve	upasattvāni
Vocative	upasattva	upasattve	upasattvāni
Accusative	upasattvam	upasattve	upasattvāni
Instrumental	upasattvena	upasattvābhyām	upasattvaiḥ
Dative	upasattvāya	upasattvābhyām	upasattvebhyaḥ
Ablative	upasattvāt	upasattvābhyām	upasattvebhyaḥ
Genitive	upasattvasya	upasattvayoḥ	upasattvānām
Locative	upasattve	upasattvayoḥ	upasattveṣu

Compound upasattva -

Adverb -upasattvam -upasattvāt