anyone know of a script that will create interior crops?

Hi @Kev28410820xkum , try this:

app.scriptPreferences.measurementUnit = MeasurementUnits.POINTS;
app.activeDocument.zeroPoint = [0, 0];
var ll = 12, //line length
    lt = 1, //line thickness
    p = app.activeWindow.activePage,
    pb = p.bounds,
    cl = makeLayer(app.activeDocument, "Crop Marks");

cl.move(LocationOptions.AT_BEGINNING);
app.activeDocument.activeLayer = cl;

//horizontal 
var myLine = makeLine(p,ll,lt,true)
myLine = makeLine(p,ll,lt,true);
myLine.move([pb[3]-ll,0]);
myLine = makeLine(p,ll,lt,true);
myLine.move([0,pb[2]-lt]);
myLine = makeLine(p,ll,lt,true);
myLine.move([pb[3]-ll,pb[2]-lt])

//vertical 
myLine = makeLine(p,ll,lt,false)
myLine = makeLine(p,ll,lt,false)
myLine.move([pb[3]-lt,0]);
myLine = makeLine(p,ll,lt,false);
myLine.move([0,pb[2]-ll]);
myLine = makeLine(p,ll,lt,false);
myLine.move([pb[3]-lt,pb[2]-ll])

app.scriptPreferences.measurementUnit = AutoEnum.AUTO_VALUE;

/**
* Make a graphic line 
* @ param page destination 
* @ param line length 
* @ param line thickness 
* @ param true horizontal or false vertical 
* @ return the line 
*
*/
function makeLine(p,l,t,h){
    var ln = p.graphicLines.add({strokeColor:"Black", strokeWeight:t});
    if (h) {
        ln.geometricBounds = [0,0,0,l];
        ln.strokeAlignment=StrokeAlignment.INSIDE_ALIGNMENT;
    } else {
        ln.geometricBounds = [0,0,l,0]
        ln.strokeAlignment=StrokeAlignment.OUTSIDE_ALIGNMENT;
    }
    return ln
}


/**
* Makes a new named Layer 
* @ param the document to add the layer 
* @ param layer name 
* @ return the new layer 
*/

function makeLayer(d, n){
    if (d.layers.itemByName(n).isValid) {
        return d.layers.itemByName(n);
    } else {
        return d.layers.add({name:n});
    }
}