Choose "Add to archive..." from the context menu. Configure Solid Option:
In the "General" tab, set to RAR (Solid mode only works with RAR, not ZIP). Check the box for "Create solid archive" .
To create a "solid" piece (or a solid archive) from your Linsh.rar data, you are essentially treating all compressed files as a single data block to increase compression efficiency. This is best achieved using on Windows, as solid mode is a native RAR feature. Here is how to create a solid RAR file:
Are you trying to create or turn multi-part files (.part1, .part2) into one ?
Adding or extracting single files from a solid archive takes much longer because the entire archive must be processed.