---
title: Open a subledger
slug: tutorials/open-a-subledger
docTags: 
createdAt: 2026-04-19T07:24:18.368Z
---

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## What you will learn

✅ How to open a subledger account in COS Explorer

You can also use the [Create subledger](docId\:K40F8Ih5SnvtbAbcEJ1MR) endpoint to perform this task via API.

:::hint{type="info"}
Learn about [Subledgers](docId\:OdZF-4AInebu2YUz5GRCs). 

Learn about [Accounts](docId\:ZQyAf4oeI1rEzpBOI78MJ). 
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## Before you begin

Make sure you have:

- [COS Explorer credentials](docId\:JwSEUG3ELF_gXLhy6T9KI) 
- Account number of the account you are creating the subledger under (master account)
- The name of the account you are creating the subledger under
- Classification of the account (business or personal)

Helpful to have:

- Name of the customer you are creating the subledger for. This is the name that appears on that customer's customer record.
- Information about the beneficiary, if relevant:
  - COS Reference ID
  - Name of the beneficiary (either the individual legal name or the business legal entity name)

## Process overview

Open a subledger account under a master account for an individual or business.

## Open a subledger account

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A red asterisk (\*) indicates a required field.
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Under **Core**, click **Deposit Sub Ledgers**. The Deposit Sub Ledgers screen appears, listing all existing subledgers.
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Click **+ Open Sub Ledger**.
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In the Open Sub Ledger Account screen fill in the account details.

1. For the Master Account #, enter the account number of the account you are creating the subledger for. you can search for this.
2. For the Account Title, enter the name on the master account.
3. For Customer, enter the name of the customer you are creating the subledger for. You can search for this.
4. For Classification, select either **Personal** or **Business**, as appropriate.
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Should a beneficiary for the account be relevant, complete the fields there.
The **Reference Id **refers to the beneficiary's customer record reference ID.
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