How to edit a block with visibility of main drawing in AUTOCAD???
Do it as per downward ...
1) Select the block.
2) Press Right Click and choose Edit Block In Place.
3) Choose OK when the reference edit dialog-box come.
4) Now you can edit your chosen block without Vanishing main Drawing.
5) For save the changes of the block, click the option edit reference and select save changes or ignore the changes select discord changes.
6) Then select OK for confirmation...