If you have a model with more than one Piece you may want to be able to decide when you create an order if some piece disappears.
Of course you can do this by changing to Drawing Mode with F12 and removing it.
However you read in the previous chapter about another possibility which does not need changing to Drawing Mode when you are entering a position in an order: when the units value is visible and is left empty when you are creating an order, then the corresponding piece is not taken into account for either weight calculations or printing.
Also an Auxiliary Measurement is not printed if its value is visible (by default is visible) and it is left empty.
It may happen that some item should not be printed if another item to which it is closely related is not printed. For instance take the case of some models of the initial collection like: 3,4,5,6,7,11,13... . You may have noticed that when you are making an order and use one of these models, if you leave empty the value of an Auxiliary Measurement, it is not printed. If there is some Auxiliary Line which is drawn between the Auxiliary Measurement and the piece, this Auxiliary Line also disappears. Thatís because when these models were created they were told that each Auxiliary Line depended on the corresponding Auxiliary Measurement. If these models had more than one piece then it would also make sense to set a dependence relation to the corresponding piece, so that if this Piece disappears, then the Auxiliary Line also disappears.
To tell the program that an Item depends on another Item, do this:
Make sure you are working with Item (default setting), select the piece with the mouse and choose Drawing->Change Properties of Current Item/Member/Value or press Enter.
Now you see a window with the properties of this Piece. On its top left corner you can read the Item number.
You can also see the two fields with the literal Depends on. You can inform one of them, both or none. In each field you can type the number of another Item on which this Items depends. If you inform both fields, this means that this Item will only be printed if both Items are printed. You can easily find out the number of another Item by clicking on it and opening its property window or just have a look at the top of the window where the number of the selected Item is shown.
You can see how this has been done with these models of the initial collection: 3,4,5,6,7,11,13 (and others). Just choose General->Models->Add / Update / Delete, type the model code, click on an Auxiliary Line, press Enter and youíll see in the Depends on field the Item number of the Auxiliary Measurement it is related to.