How to remove block in autocad

Depending on your version of ACAD, you have several options of redefinition (-insert blockname=, using the browse button in the insert command, tool palettes, the blocks palette, and design center).  

The designcenter is a command that isn't implemented by that name.  Use ADC or content.

It can access different types of content from external drawings and can be used to redefine blocks.

The blocks palette is only available after 2019.

Your main problem is probably that you have nested your block definition into a external content file by the same name.

See post 3.

In order to use tool palettes to redefine, you need to create a library drawing that contains the block definition you want to redefine.  Then from that content drawing, drag the inserted block to the palette.  Only then will you have the option to redefine from a tool palette.  When changing the block definition, do so inside the library drawing.  The blocks palette has more capabilities but tool palettes are great.

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