Add info + guide about Polkadot Fellowship Sub Treasury

docs/learn/learn-guides-fellowship-sub-treasury.md

@@ -0,0 +1,27 @@
+---
+id: learn-guides-fellowship-sub-treasury
+title: Create a Fellowship Sub-Treasury Proposal - Polkadot-JS Guides
+sidebar_label: Create a Fellowship Sub-Treasury Proposal
+description: Create sub-treasury proposal for the Polkadot Technical Fellowship
+keyword: [guides, polkadot-js, accounts, treasury, fellowship]
+slug: ../learn-guides-fellowship-sub-treasury
+---
+
+Spend proposals can be created via [Subsquare](https://collectives.subsquare.io/fellowship). A
+preimage will be necessary, and may be created via Subsquare, or Polkadot JS.
+
+## Creating a DOT Spend Preimage
+
+This is an example of an
+[extrinsic](https://polkadot.js.org/apps/?rpc=wss%3A%2F%2Fwestend-collectives-rpc-tn.dwellir.com#/extrinsics/decode/0x410503010100a10f000100000300010100000000000000000000000000000000000000000000000000000000000000000000)
+which specifies the beneficiary on AssetHub. Keep in mind that the amount must be specified in
+plancks, [which can be easily converted here.](https://sr25519.com/dots-to-planck-polkadot/)
+
+You may also find an example of a
+[successful spend here.](https://collectives.subsquare.io/fellowship/referenda/186)
+
+## Submitting the Proposal
+
+Once a preimage is acquired, the proposal may be created and submitted via
+[Subsquare](https://collectives.subsquare.io/fellowship). Note that you must be either a **Fellow**
+or an **Architect** to create such a proposal.

docs/learn/learn-polkadot-opengov-treasury.md

@@ -109,6 +109,11 @@ Rather than have many referenda through OpenGov, the
 sub-treasury (through [governance](./learn-polkadot-opengov)), from which each respective collective
 can spend funds (depending on their specific rule set).
 
+An example of a sub-treasury is the
+[Polkadot Technical Fellowship's](./learn-polkadot-technical-fellowship.md#fellowship-sub-treasury)
+treasury, which operates a treasury which utilizes tracks within the Fellowship to fund proposals.
+Spends may be requested by any asset that the sub-treasury owns, for example, DOT or a stablecoin.
+
 New treasuries could be added to respective
 [system chains](./learn-system-chains#existing-system-chains) through governance by adding more
 instances of this pallet.

docs/learn/learn-polkadot-technical-fellowship.md

@@ -131,3 +131,19 @@ from rank 1 to rank 2 can only be voted by members whose ranks are greater than
 Promotion of the Polkadot Fellowship members from rank 5 needs to be done through an OpenGov
 referendum. For more information, check the rank updates section on
 [the fellowship dashboard](https://polkadot-fellows.xyz/#/membership).
+
+## Fellowship Sub-treasury
+
+The Polkadot Technical Fellowship has its own sub-treasury, of which its members can submit spend
+proposals through the following tracks. Spends can be disbursed into any account on
+[AssetHub](./learn-system-chains.md#asset-hub):
+
+- [`Fellows`](#technical-fellowship-ranking-and-salary): for amounts up to 10,000 DOT
+- [`Architects`](#technical-fellowship-ranking-and-salary): for any amount of DOT
+
+Once a spend is approved, it must be manually claimed by the beneficiary account via the
+`fellowshipTreasury.payout` extrinsic.
+
+For each of these tracks, no more than **ten** general proposals (including whitelisting and
+treasury proposals) can be simultaneously voted on.
+[Refer to this tutorial to learn how to submit spend proposals as a fellow.]()