Hello @useless_wizard ,

Welcome to our community.

Referring to spec of Archer C50-v6, its operation modes include Router Mode, Access Point Mode, Range Extender Mode. 

For your need, you can try to set it to Range Extender Mode.  Please refer to Archer C50(EU)_V6_User Guide (from page 94)

Hello @useless_wizard ,

It is highly recommended that you set the C50 to Wireless router mode to ensure a more stable network connection.

As far as I know, most current router models no longer support WDS functionality. 

Based on your testing, the Archer C50-v6's web interface does not include a WDS option. Page 114 of https://www.tp-link.com/in/document/75999/ also mentions the WDS bridging function. 

Please note:  WDS bridging only requires configuration on the extended router.

If you intend to use it as the main router, you won't be able to use this function properly.

In addition, the User Guide link https://www.tp-link.com/in/document/75999/ provides an introduction to the C50-v1. If you still cannot see the relevant WDS options after switching to range extender mode, this feature likely doesn't exist in V6. If so, I will report this to the relevant department for an update to the User Guide.