Declension table of ?sartavya

Neuter	Singular	Dual	Plural
Nominative	sartavyam	sartavye	sartavyāni
Vocative	sartavya	sartavye	sartavyāni
Accusative	sartavyam	sartavye	sartavyāni
Instrumental	sartavyena	sartavyābhyām	sartavyaiḥ
Dative	sartavyāya	sartavyābhyām	sartavyebhyaḥ
Ablative	sartavyāt	sartavyābhyām	sartavyebhyaḥ
Genitive	sartavyasya	sartavyayoḥ	sartavyānām
Locative	sartavye	sartavyayoḥ	sartavyeṣu

Compound sartavya -

Adverb -sartavyam -sartavyāt