How to reuse circuit INITIAL conditions (at simulation time t=0) at multiple instants during a single transient run

Dear All,

I want to inject a pulse current at certain node of a periodic circuit like Oscillator.

I need to check the oscillator's steady state phase shift if the pulse injection happens at different instants during one period of oscillation.

This can be done, by running multiple simulations ( basically a parametric sweep) with shifted instants of pulse injection.

But, running multiple simulations is very time consuming.

To speed up the simulation process, one can run the simulation at one go with reusing circuit INITIAL conditions (at simulation time t=0) at multiple instants. 

For example:- If total duration is 1000 ns, I can reuse the INITIAL condition at 200ns, 400ns, 600ns ... ... 800ns, The pulse injection can happen at 150ns, 460ns,670ns ..... 890ns (shift of 10nS from the previous instant).

Can anybody please tell how this can be achieved ?

Kind Regards,