I will keep the answer simple and only within authentic Jain topics.

From your words I understand three separate Jain terms mixed together:

• Samavasaraṇa (समवसरण / समोशरण)
• Chatra / Chattri (छत्र / छत्त्री)
• Pratima (प्रतीमा) – the spiritual stages of a śrāvaka (lay follower), including 8th, 10th etc.

I’ll explain each briefly.

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1. What is Samavasaraṇa?

• When a Tirthankar attains Keval‑jñān (infinite knowledge), the devas create a special divine assembly place called Samavasaraṇa.
• In this place:

- The Tirthankar sits on a simhāsan (lion‑throne) in the center. - All four directions get equal importance; beings from all sides can see and hear Bhagwan. - Devas, humans, animals, hell‑beings, etc., all can come and listen to dharm‑deshnā. No enmity works there.

In our temples, we sometimes make:

• Samavasaraṇa models / temples / ghabhāro, or
• Samavasaraṇa “chhatri” (umbrella‑like small shrine or dome)

These are symbolic – to remind us of:

• The complete impartiality of a Tirthankar
• The universal compassion of his preaching

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2. Meaning of “Chhatra / Chattri” in Jain context

• A chhatra (umbrella) above Bhagwan’s idol or in Samavasaraṇa models is a symbol of:

- Supreme honor to the Tirthankar - The protection of true dharma

• Sometimes three umbrellas are shown one above another; traditional ācāryas often explain them as indicating:

- The three jewels – Samyak Darshan, Samyak Jñān, Samyak Chāritra - Or the highest status of Tirthankar among all beings

So “Samovasaran Chattri” usually means a small shrine / canopy structure made in the style or memory of Samavasaraṇa.

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3. Pratima of a Śrāvaka (lay follower) – where “8th, 10th” come in

In Jain śāstra, a serious lay follower gradually climbs spiritual levels called Pratima.

Number of Pratima

• Śvetāmbara and Digambara āgams – generally speak of 11 Pratima for a śrāvaka.
• After these, one moves towards muni‑dīkṣā.

Names vary slightly by tradition, but in simple form:

1. Darśan‑Pratima – firm right faith in true Jain dharma.
2. Vrat‑Pratima – strict practice of the 12 vows of a śrāvaka.
3. Samayik‑Pratima – regular, pure samayik.
4. Pauṣadha‑Pratima – doing pauṣadha as mini‑monk on certain days.

5–7. Further tightening of conduct (food discipline, non‑violence, brahmacharya, etc.)

1. More renunciation of worldly activities / occupations (name and exact rules differ slightly in Digambar–Śvetāmbara texts).
2. Further giving up of possessions (parigraha‑tyāg).
3. Stopping approval of household activities – even where others run the house, one does not mentally “own” or approve it.
4. Complete śrāvak‑renunciation state, very near to muni life.

So when people say “aṭhmi, dasmi, bārami pratima” in day‑to‑day speech, they generally mean:

• Higher stages of strong renunciation while still technically a householder.

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4. Relation between Samavasaraṇa‑Chhatri and 8th / 10th Pratima

Classical Jain scriptures:

• Describe Samavasaraṇa as a divine creation for Tirthankars.
• Describe Pratima as stages of lay conduct.

They do not normally make a direct rule like: > “At 8th or 10th Pratima you must / must not build or worship a Samavasaraṇa Chhatri.”

So, in pure śāstric sense, these are two separate subjects:

• Samavasaraṇa / Chhatri – subject of Tirthankar and temple‑construction symbolism.
• Pratima – subject of personal conduct and renunciation of a śrāvaka.

Specific traditions, sanghs, or ācāryas may:

• Encourage certain special pūjās, tapas, or temple‑seva at higher Pratima levels,
• But those details belong to local maryādā (discipline), not to the basic universal Jain āgamic rule.

For such very specific practice, a follower should follow the guidance of his/her own ācārya / guru / gacch / sampradāy, because maryādā can differ.

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If by “Samovasarna Chattri atth das doy pratima” you meant:

• 1) the meaning of Samavasaraṇa Chhatri, and
• 2) what 8th and 10th Pratima are,

then the above is the authentic Jain explanation, kept simple and within traditional understanding.