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how to add multiple blocks at once to my drawing? Now I have to add hundreds of blocks one by one. I believe this can be done easier
You could use the code provided by @Martin Drese here: https://forum.bricsys.com/discussion/comment/32378/#Comment_32378
Attach all the blocks as xrefs and then simply "bind or insert" them through the drawing explorer.
Inserting them will merge the layers from the blocks with the drawing and binding will just create new ones named "blockname¦layername". Inserting would certainly be a good choice for you.
Dont forget to audit and purge the drawing afterwards.