Symbols on a diagram can be linked to other diagrams as parents.

Child pages are diagram which are linked to a parent Symbol.

Symbols on Child diagram may themselves have further diagram underneath them.

One child diagram may belong to several parents. This is done by attaching the parent symbols to the particular diagram - this uses no extra file space and provides Control Draw with the ability to subsequently count and populate the database with all instances of the Symbols objects.  Thus, for example, if an object such as a Control Module occurs many times, the Control Module need be drawn once only.

The presence of a child diagram under a symbol is indicated by a rectangle next to the symbol, and a number (the child diagram number).

Note - in fact a page is just the same whether it is a child or not. It is only the child property of symbol in a page that makes a child page instance exist.

Setting the parent child link

This can be done at various time with Control Draw. It is possible to draw all the pages and then link them with the Link page selector , or to create each new child page from the Link page selector

The line colour and style of the child highlight  box are set in the Preferences

Optionally the actual child drawing name can also be displayed, by selecting View Child Name from the menus

It is possible to nest drawings under drawings almost indefinitely, subject to overall Windows memory limitations. However, the Control Draw is limited to 8 levels in certain functions such as the Database instance class fields.

It is highly recommended that you do not exceed this number of levels in your drawings