How to create a custom SIMULINK library block from legacy_code tool programmatically?

I have a C-function and I want to create a block in an existing SIMULINK library. If I give library name in Legacy_code tool as modelname I get the following error

Simulation of model 'TestLib' is not allowed because it is a block diagram library

Is there any way to create/copy/add a block to a custom SIMULINK library programmatically?

Answer 1

[Urmila Rajpurohith]

You can refer to below documentation for how to design and create custom block

https://www.mathworks.com/help/simulink/ug/tutorial-creating-a-custom-block.html

[Saulat Chughtai]

Sorry Urmila Rajpurohith, The point is not how to create a custome block. the point is that

1. Legacy_code tool creates a block in a new model
2. Can this block be moved to an existing SIMULINK library programmetically?