when I created a model I did mistake, and I could not undo to retain back to the right action, could you please assist me to figure out from where I do the undo and redo?
you have to go back your sketch and correct your mistake! in the other modules like property, assemble and etc, the only way to correct your mistake is just "Edit menu"!
If you are familiar with python scripting in ABAQUS, you can edit the *.jnl file associated with the *.cae file, erase all lines after the last "# Save by "... option and then reload the script in a new empty model database (new cae file) by selecting "Run script" from the "File" menu, and then at the browsing window that appears, select the jnl file.
This operation will restore your model to the state it was when it was last saved by the user.