Thank you for your comment. I've tried this before, but somehow LAStools does not let me > Save to File or > Save to Temporary file. LAStools is in C:\LAStools

I've added some info, hope this helps. Thanks again!

Thank you for your comment! I tried to get info of any classifications via the the lasinfo tool (after I used the text2las on the .txt file LiDAR data). However, since the .txt file only has the three columns of x,y,z coords, the following conversion to .las doesn't seem to have any classifications (yet). Can the classification be added after? I hope my answer makes a bit of sense, otherwise please let me know.