गोपयसोर्यत्

Operational rule vidhi

The affix यत् comes in the sense of 'product or part' after the words 1. गो and 2. पयस्.

Word by word (padaccheda)

Left context गोपयसोः pañcamī · dvivacanaSubstitute / term य prathamā · ekavacana

Left context Pañcamī (5th case): "after X", the operation applies to what follows (1.1.67 तस्मादित्युत्तरस्य). Also used for limits and sources.
Substitute / term Prathamā (1st case): in operational rules, the substitute or the thing introduced; in definitions, the term or its referent.

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गोपयसोः यत्

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

The affix यत् comes in the sense of 'product or part' after the words 1. गो and 2. पयस्।
Thus गव्यम् 6.1.79, पयस्यम् ॥

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