To changing colors and linetypes of the layers of child Xrefs  within separate viewports, try this procedure. AutoCAD treats Xrefs like blocks. That is, they can be renamed, copied, rotated, mirrored, etc. Once the Xref is attached to its specific layer (and NOT 0), you can type the command rename. Now, select "Block" at the next command prompt. You'll be prompted for the block name to change and then asked for the new block name. Once you've changed the Xref's name, attach the same Xref again, being sure to attach it to its specific layer. You now have the same Xref attached to the parent file twice, but with two separate names. When you open the Layer dialog box, you'll now have two  separate prefixes of the same layers for the child Xrefs. This allows the manipulation of the color and linetype of the individual layers.

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