I'm unable to modify an existing drawing

Hi, I'm a bit rusty on CAD! I have been given a complete elevation drawing of a building, and I need to modify it.

However, I cannot select any given line; they all appear to be joined together. This is to say that if I try and select one line, every line in the entire drawing is selected. Also, I cannot seem to see what layer they are in which is confusing me even more!

Please help!!

Could it be that you have selected a block?

For layer does it say "varies" by any chance?

Sounds like the entities are a block, or xref, or maybe a group. Select an entity and look in Properties.

Hi, I have selected the entity, and looked in drawing properties from the file tab. Didn't really tell me anything! Is there a way to separate the block so I select individual lines?

I didn't mean Drawing Properties from the File menu... I meant Properties as in Ctrl+1 or rt-clk -> Properties

You could try Explode.

It could well be that it is a block I have selected - do you know of a way of modifying the block back into its component parts? Is that the 'explode' function?

The layer the drawing is in isn't called 'varies', but it is showing in a different colour than its summary in the drop-down menu suggests, oddly. The menu says it should be black, but on my screen it is showing as flourescent green!

Yes, the Explode command will separate a compound object into its individual entities.

The color is different than that assigned to the layer? Perhaps someone decided to override the color instead of using color ByLayer.

I have figured it out!!! Thanks for all your help, it is much appreciated. My day has got better now!

Glad to hear you got it solved. Thanks for updating us.

You're entirely welcomed.