OCAD for Homebrewing

There are some tips and tricks that make home-brewing OCAD editing much easier. Most of them can be found in the internets, but I have not seen nice sources.

1. Hiding of symbol
1. How:
1. Select an object or symbol
2. On keyboard: F4. 
3. All of the objects with the given symbol disappear.
4. Do what you need to do
5. select the symbol that was hidden.
6. Click f2.
2. You can do this also do a group of symbols - select everything and say F4
3. This is useful for doing work in complicated/dense areas where lots of features are not allowing to draw clean lines. For example, when you are in a steep section with lots of contour lines, you may want to hide them.
2. Following another line
1. Why: 
1. there is a road somewhere and you need to have green on one side and yellow on other.
2. you don't want to get the green on the other side. 
3. and you don't want the green to be away from the road.
2. How:
1. start drawing the line.
2. press control, keep pressing it.
3. click with mouse (left button) on the line you want to follow and keep holding it
4. now move the pointer to the place till which you want follow
5. release mouse
6. the new line should be following 
3. Sometimes even with this feature you can see tiny white line. OCAD has bugs.
4. Once you have two lines together and you need to shape them somehow together, you are in bad luck - I do not know how to do that nicely.
3. Custom shortcuts:
1. Why:
1. once by computer, you need to be working fast, don't waste time
2. use shortcuts!
2. I use the following:
1. ctrl+d for duplicate in place (fill, make border, duplicate identically in object menu)
2. ctrl+f for forcing a different symbol (usually duplicate in place, then choose a symbol and then force a symbol on top)
1. this is useful when creating borders of sorts or just making some contour line a lake or similar.
3. ctrl+r - for reverse a feature - if you have a cliff with ticks to one side, this is how you can get them to another
4. ctrl+t - for removal of vertices 
3. This was mentioned here.