How to constrain overlay shape from extending beyond base shape

[gijeet]

Hello, beginner here.  I'm trying to overlay lines on a solid background shape and need to constrain the overlay shape from extending beyond the base shape.  I've attached a pic.  I want the red lines from extending past the yellow base.  The yellow base fits like a puzzle piece into another piece so the lines need to be constrained in the yellow piece.  Any help is appreciated.  thanks!

[Old Bruce]

Copy your yellow puzzle piece and use it to clip the redlines pic.

[Alfred]

1 hour ago, Old Bruce said:

Copy your yellow puzzle piece and use it to clip the redlines pic.

The yellow piece will remain visible when you use it to clip the starburst, so you don’t need to make a copy of it.

[gijeet]

Sorry but I'm not sure what either of you mean.  Just so we're all on the same page.  The file is a .png so there is a transparent background.  The base yellow piece is a separate layer.  The red starburst is laid on top of the yellow puzzle piece.   The red lines cannot extend past the black border on the yellow piece.  Not sure what you mean by clipping it?  Sorry for the ignorance. 

[h_d]

Hard to describe in words, but group the red lines and drag them over the orange shape as shown below:

 

Check on the highlight in the layer panel. It's not intuitive or straightforward but the highlighting from just away from the left-hand edge all the way to the right-hand edge of the orange layer means you're doing it right.

 

[gijeet]

WOW!!  Fantastic!  Thanks for the video, that made it so simple and easy!!    You saved the day!!  Thanks so much!  You Rock!!