How to paste texture to another texture

In c2 it is possible to draw a quad of texture1 onto texture2 by using:

glw.setRenderingToTexture(renderToTexture);
glw.setTexture(textureToPaste);
glw.quad(...args);

It's not as direct as your example, but perhaps something with

CreateDynamicTexture(width, height, opts)

and

UpdateTexture(data, texture, opts)

construct.net/en/make-games/manuals/addon-sdk/reference/graphics-interfaces/iwebglrenderer

Thanks Mikal - I think I'm going to have to do some experimenting...