Hi Tuan, You can cross-reference both DGN files i.e. reference DGN A to DGN B and vice versa. To create a connection between two pipelines modeled into two DGN files you need to follow the steps below. Create a pipeline and place a pipe with flange in Model A. Create second DGN file and attach Model A into that file. Create Pipeline and start routing the pipe from the flange of referenced pipeline. Joint is created in Model B so you don't have to worry about creating the joint in model A. As you can see in the item browser FLANGE_JOINT and GASKET are in Black color which means they are in active model (Model B). Now go back to Model A and reference in Model B. As shown below, now in Model A, FLANGE_JOINT is greyed out because this is part of referenced file. Like this you can maintain connectivity across the different models. Hope this helps! Regards, Harpreet
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