how to make if method inside an if then in fandom code example

Example 1: how to make if method inside an if methen in fandom

*if (((var1 > 10) and (var2 > 20)) and (var3 > 30))

Example 2: how to make if method inside an if methen in fandom

{{#if:{{{A|}}}{{{B|}}}|Do this!}}
The "AND" logic, if A and B:

{{#if:{{{A|}}}|{{#if:{{{B|}}}|Do this!}}}}