I didn't really understand your question, but this what I thought you want to do, see if it helps:
% two random data
dat1 = rand(1,10);
dat2 = rand(1,10);
fig = figure('MenuBar','None');
Plots = uimenu(fig, 'Label', 'Plots'); % Menu
% Its Submenus
uimenu(Plots, 'Label', 'Plot 1', 'Callback', @(~,~) plot(dat1, 'r'));
uimenu(Plots, 'Label', 'Plot 2', 'Callback', @(~,~) plot(dat2, 'b'));