I think this is just due to users not properly following up with the solution to their posts, as I certainly have seen solutions to this before… As seen here, one of the users on this thread above you created a new post and found a solution: Get DetailCurve From detail line family - #6 by awilliams
Dimensioning rebar is an entirely different topic than dimensioning detail lines, so this is a different topic. Follow @Yna_Db 's suggestion and create a new post! Many people are very willing to help 