ltspice sine wave voltage source question

Hi to all.
how do you set up a voltage source to do the following.
Initially In want a sine wave at a certain frequency and amplitude and
after a predetermined time I want it to change its amplitude.
ie: 1khz at 200mv and after say 100ms change to 1khz at 300mv.
Cheers
Rob

 

Hi there. Thanks for the reply.
I have found another way.
I have used the "Modulator" found in the special functions folder.
Does exactly what I want.
Set a pulse (200mv to 300mv , 100ms delay) connected to the AM
input.Mark , Space = 1k.
Output is a sine wave at 200mv that goes to 300mv after 100ms.Basically
I'm just amplitude modulating a 1khz sine wave.
Useful tool.
Cheers
Rob