---
title: Migrate legacy feature
slug: feature-experimentation/docs/migrate-legacy-feature
createdAt: 2026-08-05T20:39:53.000Z
---

- Optimizely Feature Experimentation
- Optimizely Full Stack (Legacy)

This topic maps each corresponding UI element for a feature with two experiments in[ legacy Optimizely Full Stack Experimentation](docId:6_ik6SSz-WyJLWuCQw7BT) to a flag with two A/B tests in [Optimizely Feature Experimentation](docId\:eH-UMm_rOn_GdGDGLV6__). See [Feature Experimentation application migration](docId\:IUHqAimUTD7qd2FENlvSw).

When there are multiple rollout rules on a Full Stack feature, Optimizely converts the Full Stack **everyone rule** to the default Feature Experimentation **everyone else rule drop-down** (must be either 0 or 100%, nothing in between).

When there is one rollout rule on a Full Stack feature (default everyone rule), Optimizely adds it as a new [Targeted Delivery rule](docId\:R0KSPrSRYev0Q6jXL27QK) in Feature Experimentation (allowing for any percentage between 0 and 100).

1. The feature name (**with\_audience**) in legacy Full Stack becomes the flag name in Feature Experimentation.
2. The feature key (**with\_audience**) becomes the flag's key.
3. The feature's variables (**str\_var**) become the flag's variables.
4. The feature test experiment (**feature\_test\_archived**) becomes an A/B test rule attached to the flag.
5. The feature test experiment (**started\_running\_feature**) becomes an A/B test rule attached to the flag.
6. The targeted rollout rule state **on** or **off** becomes the rule's status, **play** or **paused.**
7. The targeted rollout traffic allocation **Traffic %** (**72**) becomes the rule's **Ramp Percentage**.
8. The targeted rollout audience becomes the targeted delivery rule's audience (**aud1**).

- Legacy Optimizely Full Stack Experimentation

  ![legacy-single-rule.png](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/803veFqN5jPHystZd8bQb-20260720-145820.png)
- Optimizely Feature Experimentation

  ![fx-with-audience.png](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/XG_AMaMndZE9MrJ4nNcZ0-20260720-145820.png)

  ![fx_-Single_rule_feature_Mappings-variables.png](https://api.archbee.com/api/optimize/BrbvVORKJ5iIeSMZye5kI/bC8bh0hUzHEtX9Jxux8Et-20260720-145820.png)