विभाषा सृजिदृशोः

Operational rule vidhi

थल् the personal-ending of the लिट् (Perfect Tense) gets the augment इट् after सृज् and दृश्.

Word by word (padaccheda)

Substitute / term prathamā · ekavacanaTarget सृजिदृशोः ṣaṣṭhī · dvivacana

Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.
Target Ṣaṣṭhī (6th case): names what gets replaced, "in place of X" (1.1.49 षष्ठी स्थानेयोगा).

Dotted words are technical terms. Hover or tap one to see its card.

Full reading

सृजिदृशोः

Pāṇini leaves out words that carry over from earlier sūtras. Expand to see the rule as a reader actually understands it.

As a rewrite rule (sketch from case endings)

सृजिदृशोः → optional

Replace sṛjidṛśoḥ with vibhāṣā, optionally. Inherited words (anuvṛtti) may add further conditions.

Commentary

थल् the personal-ending of the लिट् (Perfect Tense) gets the augment इट् after सृज् and दृश्।
As सस्रष्ठ or ससर्जिथ, दद्रष्ठ or ददर्शिथ ॥ See 6.1.58 for अम् augment.

Śrīśa Chandra Vasu, The Ashtadhyayi of Panini (1897), via ashtadhyayi.com.