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The invention relates to a process for bringing in breaking -through (BT) (1) at a pre-determined position in a substrate (2), which is made as printing template, by means of a laser. The substrate (2) is positioned here with the help of a fixing medium (3), which is made as a tenter frame. A local displacement of the BTs (1) on account of the subsequent machining steps, which lead to a changed state of tension of the substrate (2), is avoided by firstly determining the co ordinates of a central reference point (4). The respective distance (a) of the pre determined position of the BTs (1) from this reference point (4) is fixed afterwards and an order of precedence (5) is derived out of this. This order of precedence (5) then forms the basis of a machining program (6), through which the movement track of the laser head is controlled and the BTs (1) are brought in the substrate (2). (FIG. - 1