Declension table of ?sartavya

Masculine	Singular	Dual	Plural
Nominative	sartavyaḥ	sartavyau	sartavyāḥ
Vocative	sartavya	sartavyau	sartavyāḥ
Accusative	sartavyam	sartavyau	sartavyān
Instrumental	sartavyena	sartavyābhyām	sartavyaiḥ sartavyebhiḥ
Dative	sartavyāya	sartavyābhyām	sartavyebhyaḥ
Ablative	sartavyāt	sartavyābhyām	sartavyebhyaḥ
Genitive	sartavyasya	sartavyayoḥ	sartavyānām
Locative	sartavye	sartavyayoḥ	sartavyeṣu

Compound sartavya -

Adverb -sartavyam -sartavyāt