> For the complete documentation index, see [llms.txt](https://docs.oneid.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.oneid.xyz/beginners-guide/website/how-to-use-sub-id.md).
# How to use Sub-ID
The Sub-ID allows users to link multiple wallets to a single OneID, making it more flexible and efficient for managing your digital identity. This guide provides step-by-step instructions for creating, managing, and using Sub-IDs effectively.
## **What is a Sub-ID?**
A Sub-ID is a secondary ID associated with a parent OneID.
For example, if the OneID is **oneidtest.c98**, the owner of this ID can create Sub-IDs such as:
* test1.oneidtest.c98
* test2.oneidtest.c98
* test3.oneidtest.c98
{% hint style="warning" %}
#### **Note:**
* A Sub-ID is **not an NFT**; it is just a node within the contract.
* Sub-IDs **cannot be transferred** to other users.
* The expiration date of a Sub-ID is the same as its parent OneID's expiration date.
* If the parent OneID is transferred the new owner reclaims ownership, the Sub-ID will not be removed.
* If the parent OneID expires and is registered by a new owner, all associated Sub-IDs will be removed.
* **KYC** and **Primary Name** settings are not applicable to Sub-IDs.
{% endhint %}
## **How to Add Sub-ID**
Follow these steps to add a Sub-ID to your OneID:
**Step 1:** On the **My ID** page, click the **Add Sub-ID** button.
**Step 2:** Enter the Sub-IDs you want to create. You can add multiple Sub-IDs at once.
{% hint style="info" %}
The minimum length for each Sub-ID is 3 characters or more
{% endhint %}
**Step 3:** Choose your payment method. Payment can be made in **C98** and **VIC** on **Viction network**, and the **Service Fee** is **$1** per Sub-ID.
**Step 4:** Click on **Done** to complete the payment.
After successfully adding Sub-IDs, they will appear on your **My ID** page
You can also add Sub-IDs in the **OneID detail page**
## **How to Delete Sub-ID**
If you no longer need a Sub-ID, follow these steps to delete it:
**Step 1:** Click the **Trash Icon** next to the Sub-ID you want to delete.
**Step 2:** Click **Confirm** and sign the transaction to complete the deletion.
## **How to Link Sub-ID to Multichain Wallets**
**Step 1:** Click the **Link Wallet** button next to the Sub-ID.
**Step 2:** Select the wallets you want to link. If no wallets are visible, click **Sync Wallets** to update the list from your extensions.
Once linked, wallet details will appear in both the **OneID Detail** and **My ID** pages:
## **How to Unlink Sub-ID from Multichain Wallets**
**Step 1:** On the **My ID** page, click on the Sub-ID that you wish to unlink.
**Step 2:** Click on the **Unlink Sub-ID** button.
**Step 3:** Click **OK** and wait for the Coin98 Wallet pop-up. Once it appears, sign the transaction to confirm the Unlink Sub-ID process.
