Question: Set up filter. For example,filtering colour, red, naming a filter name. Then use the copy command, how to use the chosen filter to remove the red lines in a box of lines when you select? Copy it or delete it?
Answer: If you want to remove all the red lines, you first use the fi command, select your named filters, then apply it.A selection screen will appear, select the object according to the command prompt, you can input "all" to select all objects. And then press the spacebar,you will found that only chosen red line becomes dotted line.And then exit fi command by pressing spacebar, you will find the red line becomes the selected state. And you can input e command,then you can delete the red line.
If you want to copy, then use co command after quiting the fi command .

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