Add New Build to a Bundle
PUT /admin/customfield/buildBundle/{bundleName}/{buildName}
Add new build to bundle
PUT /rest/admin/customfield/buildBundle/{bundleName}/{buildName}?{description}&{colorIndex}&{assembleDate}
Sample
PUT http://localhost:8081/rest/admin/customfield/buildBundle/New%20Name%20with%20spaces/build3?assembleDate=-111222333
Cookie: $Version=0; JSESSIONID=upm6hixpu7bjr6z4nmvhdrl; $Path=/; jetbrains.charisma.main.security.PRINCIPAL=NDgxMzQ5NGQxMzdlMTYzMWJiYTMwMWQ1YWNhYjZlN2JiN2FhNzRjZTExODVkNDU2NTY1ZWY1MWQ3Mzc2NzdiMjpyb290; $Path=/
HTTP/1.1 201 Created
Content-Type: application/xml;charset=UTF-8
Location: https://example.com/youtrack/rest/admin/customfield/buildBundle/New%20Name%20with%20spaces/build3
Content-Length: 0
Server: Jetty(7.2.0.v20101020)
Last modified: 2 February 2017