How to simulate reciprocal mutual coupling between inductors (ex 3 or 4 different inductor)? are there some plecs specific simbols?
For 3, 4, or more coupled inductors, you can use the PLECS Mutual Inductor component from Electrical > Passive Components.
Set the number of windings and enter the inductance as a square matrix. The diagonal entries are the self-inductances L_i, while the off-diagonal entries are the mutual inductances M_{ij}. For reciprocal coupling, the matrix is symmetric.
For four windings, for example:
\mathbf{L} =
\left[
\begin{array}{cccc}
L_1 & M_{12} & M_{13} & M_{14} \\
M_{12} & L_2 & M_{23} & M_{24} \\
M_{13} & M_{23} & L_3 & M_{34} \\
M_{14} & M_{24} & M_{34} & L_4
\end{array}
\right]
with
M_{ij}=M_{ji} = k_{ij}\sqrt{L_iL_j}.
The inductance matrix must be invertible. For ideal coupling that results in a singular matrix, use an inductor together with an ideal transformer instead.
Exactly as you show in the screenshot image! The semicolons ( ; ) separate each row of the matrix and spaces are used between elements in each row.