Hi @arnasvel ,

Please find AutoLISP file in the attachment.

You need to load it with APPLOAD command, then you can use new command - BL_NUMBER.

AutoCAD will ask you the number to start with, then it will ask to select objects.

You can select all objects (blocks) in the drawing and hit Return twice - in this case in all blocks that have attribute with tag "NUMERIS" these attributes will be populated with sequential numbering. The numbering will start from the  last inserted block and will end in the first inserted block.

You can select blocks one by one until you hit Return on the second prompt "Select objects", in this case the numbering will start with the first selected block and will end with the last selected block.

If this routine will help you, all kudos should go >>>>there<<<<