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Searching the internet for this feature brings many wishes but not one good solution. Now I go to matlab which has this feature available. Sorry guys.

If you're desperate for an application more like LTspice where is possible, check out Qucs. This has been a feature for a long time.

Most of us will find various other ways to work around this. The easiest being to simply delete the unneeded section(s), run the analysis, and then "Undo".

If you want to ignore a block of components, temporarily short all internal nodes to 0, then they will be excluded from the netlist without throwing an error.

If you just want to reduce the size of the .raw file, use the .SAVE directive to be selective about the analysis results that you are interested in, and disregard the rest. The .raw file can be drastically reduced by this action.