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You can global edit the material (and other attributes) by opening the pipe flextable, making sure the Material field is visible (use the yellow edit button to add it if not), then right click the material column header, choose global edit and enter the label of the material. If you only want to assign the material to a subset of pipes, you will need to apply a filter to the table first (such as from a query), then do the global edit.Since the material field is only a text field, you'll need to also add the roughness coefficient field (such as Hazen Williams C) and global edit that as well, setting it to the coefficient corresponding to the material you just global edited. The material and roughness fields are not dynamically linked.
Open a pipe Flextable, and for each material in use...
a) Filter your pipe Flextable to only show elements with that particular Material.
b) Once filtered, click the [...] on the Material field for the first entry in the table to interactively select the material, that will populate the roughness value.
c) Global edit to set all roughness' to that value.