Thanks for the help on the v.patch command. That quickly merged all of the layers together that I needed combined.
About the v.build.polyline command...Does this command join line segments that share all share-able attributes?
For example, the U.S. Census Tiger road line data has attributes for length, node ID, street name, street type, and so forth. Because the attribute values are different, the v.build.polyline command must join segments whose attribute values can be shared (like street name) while ignoring attribute values that have to be unique for each line segment (length, ID). Is that correct?
Steven Gordon