Good evening, In addition to my previous question, I am also having difficulty appending chains. If I import molecular models into Chimera/ChimeraX that each have individual model names and singular Chain IDs, is there a way to combine these into a singular model and renumber the residues as one continuous sequence throughout the combined model? For example, I have three molecular models that are each components of a single RNA molecule, and each have their own pdb file and a singular Chain ID. I know how to physically orient all of them spatially and renumber the residues of each such that when hovering over the molecular model moving from 5’ to 3’ the sequence numbering is continuous and correct across all chains. However, even when I combine the three individual models into one at the beginning and change the chain IDs of all three to be the same ID at the end, when I view the combination model in sequence viewer, it has just appended all three chains together with no regard to residue order. Since each of the three models is a chunk of double helix, I would need the numbering to be in 5’ to 3’ order throughout the entire combination model sequence viewer, in the way that I have renumbered it and in the way that it is in the visible combined model/structure. Thank you for your help.