Am a bit confused by what you mean by 'layout', so am not sure this is the correct reply.
If you are trying to place your block into a quilt in EQ, you must first create your layout using 3" blocks, and insert the 3" blocks. If your layout is made up of 1" blocks, you have to create and save individual pieces - eg. 1'' squares and hst's in the block section and insert them one by one in the quilt layout section.
Making up the 3" foundation-pieced blocks, your squares will still need to be cut at 1 1/2'' , and the triangles for the HSTs I would cut 2" squares once diagonally, then trim the block to 3 1/2" when it's all put together.