Hello,
right now there is no such a function in QCAD which will create a “Bill of Material” for you.
Nevertheless - QCAD comes with a script called “Export Blocklist” which will produce a *.csv text file which could be used to create (with the help of MS-Excel or a similar program) a Bill of Material.
The script “Export Blocklist” will list and count all existing blocks and how many times the blocks are used in your drawing.
Check it out below Menu / Misc / Block